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Logical Reasoning · Data Arrangements and Blood Relations

Blood Relations

Explanation

🔵
BLOOD RELATIONS\text{BLOOD RELATIONS}
🟢 1. BASIC BLOOD RELATIONSHIP Blood relation questions involve identifying the relationship between two people using family connections.
Blood Relation=Relationship between two members of a family \text{Blood Relation} = \text{Relationship between two members of a family}
Common relationships include:
Father, Mother, Son, Daughter, Brother, Sister \text{Father,\ Mother,\ Son,\ Daughter,\ Brother,\ Sister}
Grandfather, Grandmother, Grandson, Granddaughter \text{Grandfather,\ Grandmother,\ Grandson,\ Granddaughter}
Uncle, Aunt, Nephew, Niece \text{Uncle,\ Aunt,\ Nephew,\ Niece}
Cousin \text{Cousin}
🟡 KEY POINT
Always start from the person mentioned in the question and trace the relationship step by step. \text{Always start from the person mentioned in the question and trace the relationship step by step.}
🟢 2. IMMEDIATE FAMILY RELATIONS Father:
Father=Male parent \text{Father}=\text{Male parent}
Mother:
Mother=Female parent \text{Mother}=\text{Female parent}
Son:
Son=Male child \text{Son}=\text{Male child}
Daughter:
Daughter=Female child \text{Daughter}=\text{Female child}
Brother:
Brother=Male sibling \text{Brother}=\text{Male sibling}
Sister:
Sister=Female sibling \text{Sister}=\text{Female sibling}
🟢 3. PARENT-CHILD RELATIONSHIP If A is the father of B:
A→B A\rightarrow B
If A is the mother of B:
A→B A\rightarrow B
If A is the son of B:
B→A B\rightarrow A
If A is the daughter of B:
B→A B\rightarrow A
🟡 KEY POINT
Parent is one generation above the child. \text{Parent is one generation above the child.}
🟢 4. SIBLING RELATIONSHIP A brother and sister share at least one parent. If A and B have the same parents:
A↔B A\leftrightarrow B
If A is male:
A=Brother A=\text{Brother}
If A is female:
A=Sister A=\text{Sister}
🟡 KEY POINT
Brothers and sisters belong to the same generation. \text{Brothers and sisters belong to the same generation.}
🟢 5. GRANDFATHER AND GRANDMOTHER A grandfather is the father of one's parent.
Grandfather=Father of Father or Father of Mother \text{Grandfather} = \text{Father of Father or Father of Mother}
A grandmother is the mother of one's parent.
Grandmother=Mother of Father or Mother of Mother \text{Grandmother} = \text{Mother of Father or Mother of Mother}
🟢 6. GRANDCHILDREN A grandson is the son of one's child.
Grandson=Son of Son or Son of Daughter \text{Grandson} = \text{Son of Son or Son of Daughter}
A granddaughter is the daughter of one's child.
Granddaughter=Daughter of Son or Daughter of Daughter \text{Granddaughter} = \text{Daughter of Son or Daughter of Daughter}
🟢 7. UNCLE An uncle is generally the brother of one's parent.
Uncle=Brother of Father or Brother of Mother \text{Uncle} = \text{Brother of Father or Brother of Mother}
In some family structures, the husband of an aunt may also be referred to as an uncle. 🟡 KEY POINT
Trace through the parent first when identifying an uncle. \text{Trace through the parent first when identifying an uncle.}
🟢 8. AUNT An aunt is generally the sister of one's parent.
Aunt=Sister of Father or Sister of Mother \text{Aunt} = \text{Sister of Father or Sister of Mother}
The wife of an uncle may also be referred to as an aunt. 🟢 9. NEPHEW A nephew is the son of one's brother or sister.
Nephew=Son of Brother or Son of Sister \text{Nephew} = \text{Son of Brother or Son of Sister}
🟢 10. NIECE A niece is the daughter of one's brother or sister.
Niece=Daughter of Brother or Daughter of Sister \text{Niece} = \text{Daughter of Brother or Daughter of Sister}
🟢 11. COUSIN A cousin is generally the child of one's uncle or aunt.
Cousin=Child of Uncle or Aunt \text{Cousin} = \text{Child of Uncle or Aunt}
A male cousin is:
Male Cousin \text{Male Cousin}
A female cousin is:
Female Cousin \text{Female Cousin}
🟢 12. PATERNAL RELATIONS Paternal relationships are related through the father. Father's father:
Paternal Grandfather \text{Paternal Grandfather}
Father's mother:
Paternal Grandmother \text{Paternal Grandmother}
Father's brother:
Paternal Uncle \text{Paternal Uncle}
Father's sister:
Paternal Aunt \text{Paternal Aunt}
🟡 KEY POINT
Paternal means related through the father. \text{Paternal means related through the father.}
🟢 13. MATERNAL RELATIONS Maternal relationships are related through the mother. Mother's father:
Maternal Grandfather \text{Maternal Grandfather}
Mother's mother:
Maternal Grandmother \text{Maternal Grandmother}
Mother's brother:
Maternal Uncle \text{Maternal Uncle}
Mother's sister:
Maternal Aunt \text{Maternal Aunt}
🟡 KEY POINT
Maternal means related through the mother. \text{Maternal means related through the mother.}
🟢 14. BROTHER'S SON The son of one's brother is:
Brother’s Son=Nephew \text{Brother's Son} = \text{Nephew}
🟢 15. BROTHER'S DAUGHTER The daughter of one's brother is:
Brother’s Daughter=Niece \text{Brother's Daughter} = \text{Niece}
🟢 16. SISTER'S SON The son of one's sister is:
Sister’s Son=Nephew \text{Sister's Son} = \text{Nephew}
🟢 17. SISTER'S DAUGHTER The daughter of one's sister is:
Sister’s Daughter=Niece \text{Sister's Daughter} = \text{Niece}
🟢 18. FATHER'S BROTHER The brother of one's father is:
Father’s Brother=Uncle \text{Father's Brother} = \text{Uncle}
🟢 19. FATHER'S SISTER The sister of one's father is:
Father’s Sister=Aunt \text{Father's Sister} = \text{Aunt}
🟢 20. MOTHER'S BROTHER The brother of one's mother is:
Mother’s Brother=Maternal Uncle \text{Mother's Brother} = \text{Maternal Uncle}
🟢 21. MOTHER'S SISTER The sister of one's mother is:
Mother’s Sister=Maternal Aunt \text{Mother's Sister} = \text{Maternal Aunt}
🟢 22. FATHER'S FATHER The father of one's father is:
Father’s Father=Grandfather \text{Father's Father} = \text{Grandfather}
More specifically:
Father’s Father=Paternal Grandfather \text{Father's Father} = \text{Paternal Grandfather}
🟢 23. MOTHER'S FATHER The father of one's mother is:
Mother’s Father=Maternal Grandfather \text{Mother's Father} = \text{Maternal Grandfather}
🟢 24. FATHER'S MOTHER The mother of one's father is:
Father’s Mother=Paternal Grandmother \text{Father's Mother} = \text{Paternal Grandmother}
🟢 25. MOTHER'S MOTHER The mother of one's mother is:
Mother’s Mother=Maternal Grandmother \text{Mother's Mother} = \text{Maternal Grandmother}
🟢 26. GENERATION LEVELS Family relationships can be understood using generations. Parents are:
+1 generation +1\text{ generation}
Children are:
−1 generation -1\text{ generation}
Grandparents are:
+2 generations +2\text{ generations}
Grandchildren are:
−2 generations -2\text{ generations}
Siblings are:
0 generation difference 0\text{ generation difference}
🟡 KEY POINT
Use generation levels to simplify complicated family relationships. \text{Use generation levels to simplify complicated family relationships.}
🟢 27. FAMILY TREE A family tree represents relationships using levels. For example:
Grandfather \text{Grandfather}
↓ \downarrow
Father \text{Father}
↓ \downarrow
Son \text{Son}
For siblings:
Father→{SonDaughter \text{Father} \rightarrow \begin{cases} \text{Son}\\ \text{Daughter} \end{cases}
🟡 KEY POINT
Draw a family tree when the relationship chain contains several steps. \text{Draw a family tree when the relationship chain contains several steps.}
🟢 28. SYMBOLIC BLOOD RELATIONS Some questions use symbols to represent relationships. For example:
A+B A+B
may represent:
A is the father of B A\text{ is the father of }B
If:
A−B A-B
represents:
A is the mother of B A\text{ is the mother of }B
The meaning of each symbol must be determined from the question. 🔴 IMPORTANT
Never assume the meaning of a symbol without checking the given definitions. \text{Never assume the meaning of a symbol without checking the given definitions.}
🟢 29. STATEMENT-BASED BLOOD RELATIONS In statement-based questions, convert each sentence into a relationship. For example:
A is the brother of B A\text{ is the brother of }B
means:
A↔B A\leftrightarrow B
with A being male. If:
B is the mother of C B\text{ is the mother of }C
then:
B→C B\rightarrow C
Therefore, A is the maternal uncle of C. 🟢 30. RELATIONSHIP THROUGH TWO PEOPLE If:
A is the brother of B A\text{ is the brother of }B
and:
B is the mother of C B\text{ is the mother of }C
then:
A→B→C A\rightarrow B\rightarrow C
Therefore:
A=Maternal Uncle of C A=\text{Maternal Uncle of }C
🟢 31. RELATIONSHIP THROUGH THREE PEOPLE If:
A is the father of B A\text{ is the father of }B
B is the sister of C B\text{ is the sister of }C
then A is also the father of C, assuming B and C are siblings. Therefore:
A=Father of C A=\text{Father of }C
🟢 32. HUSBAND AND WIFE RELATIONSHIP A husband and wife are spouses.
Husband↔Wife \text{Husband}\leftrightarrow\text{Wife}
They belong to the same generation.
Generation Difference=0 \text{Generation Difference}=0
🟡 KEY POINT
Marriage relationships are not blood relationships, but they may be included in family-relation questions. \text{Marriage relationships are not blood relationships, but they may be included in family-relation questions.}
🟢 33. FATHER-IN-LAW The father of one's husband or wife is:
Father-in-law \text{Father-in-law}
Therefore:
Father-in-law=Father of Spouse \text{Father-in-law} = \text{Father of Spouse}
🟢 34. MOTHER-IN-LAW The mother of one's husband or wife is:
Mother-in-law \text{Mother-in-law}
Therefore:
Mother-in-law=Mother of Spouse \text{Mother-in-law} = \text{Mother of Spouse}
🟢 35. SON-IN-LAW The husband of one's daughter is:
Son-in-law=Husband of Daughter \text{Son-in-law} = \text{Husband of Daughter}
🟢 36. DAUGHTER-IN-LAW The wife of one's son is:
Daughter-in-law=Wife of Son \text{Daughter-in-law} = \text{Wife of Son}
🟢 37. SIBLING-IN-LAW The sibling of one's spouse is commonly called a brother-in-law or sister-in-law depending on gender.
Brother-in-law=Male sibling of Spouse \text{Brother-in-law} = \text{Male sibling of Spouse}
Sister-in-law=Female sibling of Spouse \text{Sister-in-law} = \text{Female sibling of Spouse}
🟢 38. HOW TO SOLVE BLOOD RELATION QUESTIONS First identify the person whose relationship is being asked.
Step 1: Identify the starting person \text{Step 1: Identify the starting person}
Then trace each relationship.
Step 2: Follow the relationship chain \text{Step 2: Follow the relationship chain}
Draw the family tree if necessary.
Step 3: Create a simple family tree \text{Step 3: Create a simple family tree}
Determine the generation.
Step 4: Identify the generation level \text{Step 4: Identify the generation level}
Finally, identify the exact relationship.
Step 5: Determine the final relationship \text{Step 5: Determine the final relationship}
🟡 KEY POINT
Never jump directly to the answer when several relationships are given. \text{Never jump directly to the answer when several relationships are given.}
🟢 39. QUICK RELATIONSHIP CHAIN Father's brother:
Father→Brother=Uncle \text{Father}\rightarrow\text{Brother} = \text{Uncle}
Mother's sister:
Mother→Sister=Aunt \text{Mother}\rightarrow\text{Sister} = \text{Aunt}
Brother's son:
Brother→Son=Nephew \text{Brother}\rightarrow\text{Son} = \text{Nephew}
Sister's daughter:
Sister→Daughter=Niece \text{Sister}\rightarrow\text{Daughter} = \text{Niece}
Father's father:
Father→Father=Grandfather \text{Father}\rightarrow\text{Father} = \text{Grandfather}
Mother's mother:
Mother→Mother=Grandmother \text{Mother}\rightarrow\text{Mother} = \text{Grandmother}
🟡 IMPORTANT KEY POINTS
Father’s brother=Uncle \text{Father's brother}=Uncle
Father’s sister=Aunt \text{Father's sister}=Aunt
Mother’s brother=Maternal Uncle \text{Mother's brother}=Maternal\ Uncle
Mother’s sister=Maternal Aunt \text{Mother's sister}=Maternal\ Aunt
Father’s father=Paternal Grandfather \text{Father's father}=Paternal\ Grandfather
Father’s mother=Paternal Grandmother \text{Father's mother}=Paternal\ Grandmother
Mother’s father=Maternal Grandfather \text{Mother's father}=Maternal\ Grandfather
Mother’s mother=Maternal Grandmother \text{Mother's mother}=Maternal\ Grandmother
Brother’s son=Nephew \text{Brother's son}=Nephew
Brother’s daughter=Niece \text{Brother's daughter}=Niece
Sister’s son=Nephew \text{Sister's son}=Nephew
Sister’s daughter=Niece \text{Sister's daughter}=Niece
Son’s son=Grandson \text{Son's son}=Grandson
Son’s daughter=Granddaughter \text{Son's daughter}=Granddaughter
Daughter’s son=Grandson \text{Daughter's son}=Grandson
Daughter’s daughter=Granddaughter \text{Daughter's daughter}=Granddaughter
Parent=+1 generation \text{Parent}=+1\text{ generation}
Grandparent=+2 generations \text{Grandparent}=+2\text{ generations}
Child=−1 generation \text{Child}=-1\text{ generation}
Grandchild=−2 generations \text{Grandchild}=-2\text{ generations}
Sibling=0 generation difference \text{Sibling}=0\text{ generation difference}
Always trace the relationship step by step. \text{Always trace the relationship step by step.}
Draw a family tree when the relationship chain is complicated. \text{Draw a family tree when the relationship chain is complicated.}

Example

🔵
BLOOD RELATIONS\text{BLOOD RELATIONS}
🟢 EXAMPLE 1: FATHER QUESTION: A is the father of B. How is A related to B? SOLUTION:
A=Father of B A=\text{Father of }B
🔵 ANSWER:
Father \text{Father}
🟢 EXAMPLE 2: MOTHER QUESTION: P is the mother of Q. How is P related to Q? SOLUTION:
P=Mother of Q P=\text{Mother of }Q
🔵 ANSWER:
Mother \text{Mother}
🟢 EXAMPLE 3: BROTHER QUESTION: A and B are children of the same parents. A is male. How is A related to B? SOLUTION:
A=Male sibling of B A=\text{Male sibling of }B
Therefore:
A=Brother of B A=\text{Brother of }B
🔵 ANSWER:
Brother \text{Brother}
🟢 EXAMPLE 4: SISTER QUESTION: P and Q are children of the same parents. P is female. How is P related to Q? SOLUTION:
P=Female sibling of Q P=\text{Female sibling of }Q
Therefore:
P=Sister of Q P=\text{Sister of }Q
🔵 ANSWER:
Sister \text{Sister}
🟢 EXAMPLE 5: GRANDFATHER QUESTION: A is the father of B. B is the father of C. How is A related to C? SOLUTION:
A→B→C A\rightarrow B\rightarrow C
A is the father of B, and B is the father of C. Therefore:
A=Grandfather of C A=\text{Grandfather of }C
🔵 ANSWER:
Grandfather \text{Grandfather}
🟢 EXAMPLE 6: GRANDMOTHER QUESTION: P is the mother of Q. Q is the mother of R. How is P related to R? SOLUTION:
P→Q→R P\rightarrow Q\rightarrow R
P is the mother of Q, and Q is the mother of R. Therefore:
P=Grandmother of R P=\text{Grandmother of }R
🔵 ANSWER:
Grandmother \text{Grandmother}
🟢 EXAMPLE 7: UNCLE QUESTION: A is the brother of B. B is the father of C. How is A related to C? SOLUTION:
A=Brother of B A=\text{Brother of }B
B=Father of C B=\text{Father of }C
Therefore:
A=Brother of Father of C A=\text{Brother of Father of }C
Hence:
A=Uncle of C A=\text{Uncle of }C
🔵 ANSWER:
Uncle \text{Uncle}
🟢 EXAMPLE 8: AUNT QUESTION: P is the sister of Q. Q is the mother of R. How is P related to R? SOLUTION:
P=Sister of Q P=\text{Sister of }Q
Q=Mother of R Q=\text{Mother of }R
Therefore:
P=Sister of Mother of R P=\text{Sister of Mother of }R
Hence:
P=Aunt of R P=\text{Aunt of }R
🔵 ANSWER:
Aunt \text{Aunt}
🟢 EXAMPLE 9: MATERNAL UNCLE QUESTION: A is the brother of B. B is the mother of C. How is A related to C? SOLUTION:
A=Brother of B A=\text{Brother of }B
B=Mother of C B=\text{Mother of }C
Therefore:
A=Brother of Mother of C A=\text{Brother of Mother of }C
Hence:
A=Maternal Uncle of C A=\text{Maternal Uncle of }C
🔵 ANSWER:
Maternal Uncle \text{Maternal Uncle}
🟢 EXAMPLE 10: MATERNAL AUNT QUESTION: P is the sister of Q. Q is the mother of R. How is P related to R? SOLUTION:
P=Sister of Q P=\text{Sister of }Q
Q=Mother of R Q=\text{Mother of }R
Therefore:
P=Sister of Mother of R P=\text{Sister of Mother of }R
Hence:
P=Maternal Aunt of R P=\text{Maternal Aunt of }R
🔵 ANSWER:
Maternal Aunt \text{Maternal Aunt}
🟢 EXAMPLE 11: NEPHEW QUESTION: A is the brother of B. C is the son of B. How is C related to A? SOLUTION:
A=Brother of B A=\text{Brother of }B
C=Son of B C=\text{Son of }B
Therefore:
C=Son of Brother’s Sibling C=\text{Son of Brother's Sibling}
More directly:
C=Son of A’s Brother C=\text{Son of A's Brother}
Hence:
C=Nephew of A C=\text{Nephew of }A
🔵 ANSWER:
Nephew \text{Nephew}
🟢 EXAMPLE 12: NIECE QUESTION: P is the sister of Q. R is the daughter of Q. How is R related to P? SOLUTION:
P=Sister of Q P=\text{Sister of }Q
R=Daughter of Q R=\text{Daughter of }Q
Therefore:
R=Daughter of P’s Sibling R=\text{Daughter of P's Sibling}
Hence:
R=Niece of P R=\text{Niece of }P
🔵 ANSWER:
Niece \text{Niece}
🟢 EXAMPLE 13: PATERNAL GRANDFATHER QUESTION: A is the father of B. B is the father of C. How is A related to C? SOLUTION:
A=Father of B A=\text{Father of }B
B=Father of C B=\text{Father of }C
Therefore:
A=Father’s Father of C A=\text{Father's Father of }C
Hence:
A=Paternal Grandfather of C A=\text{Paternal Grandfather of }C
🔵 ANSWER:
Paternal Grandfather \text{Paternal Grandfather}
🟢 EXAMPLE 14: MATERNAL GRANDMOTHER QUESTION: P is the mother of Q. Q is the mother of R. How is P related to R? SOLUTION:
P=Mother of Q P=\text{Mother of }Q
Q=Mother of R Q=\text{Mother of }R
Therefore:
P=Mother’s Mother of R P=\text{Mother's Mother of }R
Hence:
P=Maternal Grandmother of R P=\text{Maternal Grandmother of }R
🔵 ANSWER:
Maternal Grandmother \text{Maternal Grandmother}
🟢 EXAMPLE 15: FATHER'S SISTER QUESTION: A is the sister of B. B is the father of C. How is A related to C? SOLUTION:
A=Sister of B A=\text{Sister of }B
B=Father of C B=\text{Father of }C
Therefore:
A=Sister of Father of C A=\text{Sister of Father of }C
Hence:
A=Paternal Aunt of C A=\text{Paternal Aunt of }C
🔵 ANSWER:
Paternal Aunt \text{Paternal Aunt}
🟢 EXAMPLE 16: FATHER'S BROTHER QUESTION: P is the brother of Q. Q is the father of R. How is P related to R? SOLUTION:
P=Brother of Q P=\text{Brother of }Q
Q=Father of R Q=\text{Father of }R
Therefore:
P=Brother of Father of R P=\text{Brother of Father of }R
Hence:
P=Paternal Uncle of R P=\text{Paternal Uncle of }R
🔵 ANSWER:
Paternal Uncle \text{Paternal Uncle}
🟢 EXAMPLE 17: COUSIN QUESTION: A is the son of B. C is the daughter of D. B and D are brothers. How is A related to C? SOLUTION: B and D are brothers:
B↔D B\leftrightarrow D
A is the son of B:
B→A B\rightarrow A
C is the daughter of D:
D→C D\rightarrow C
Therefore, A and C are children of two siblings.
A=Cousin of C A=\text{Cousin of }C
🔵 ANSWER:
Cousin \text{Cousin}
🟢 EXAMPLE 18: GRANDSON QUESTION: A is the son of B. B is the son of C. How is A related to C? SOLUTION:
C→B→A C\rightarrow B\rightarrow A
A is the son of C's son. Therefore:
A=Grandson of C A=\text{Grandson of }C
🔵 ANSWER:
Grandson \text{Grandson}
🟢 EXAMPLE 19: GRANDDAUGHTER QUESTION: P is the daughter of Q. Q is the daughter of R. How is P related to R? SOLUTION:
R→Q→P R\rightarrow Q\rightarrow P
P is the daughter of R's daughter. Therefore:
P=Granddaughter of R P=\text{Granddaughter of }R
🔵 ANSWER:
Granddaughter \text{Granddaughter}
🟢 EXAMPLE 20: MIXED RELATIONSHIP QUESTION: A is the brother of B. B is the daughter of C. How is A related to C? SOLUTION:
A=Brother of B A=\text{Brother of }B
B=Daughter of C B=\text{Daughter of }C
Therefore, A and B are siblings. Hence:
A=Son of C A=\text{Son of }C
🔵 ANSWER:
Son \text{Son}
🟢 EXAMPLE 21: THREE-STEP RELATIONSHIP QUESTION: P is the sister of Q. Q is the son of R. R is the father of S. How is P related to S? SOLUTION: P is the sister of Q:
P↔Q P\leftrightarrow Q
Q is the son of R:
R→Q R\rightarrow Q
R is the father of S:
R→S R\rightarrow S
Therefore, Q and S are siblings. P is Q's sister, so P is also S's sister.
P=Sister of S P=\text{Sister of }S
🔵 ANSWER:
Sister \text{Sister}
🟢 EXAMPLE 22: FOUR-STEP RELATIONSHIP QUESTION: A is the brother of B. B is the mother of C. C is the sister of D. How is A related to D? SOLUTION:
A=Brother of B A=\text{Brother of }B
B=Mother of C B=\text{Mother of }C
C=Sister of D C=\text{Sister of }D
Therefore, C and D are siblings. A is the brother of their mother. Hence:
A=Maternal Uncle of D A=\text{Maternal Uncle of }D
🔵 ANSWER:
Maternal Uncle \text{Maternal Uncle}
🟢 EXAMPLE 23: IDENTIFYING THE PERSON QUESTION: A is the father of B. C is the mother of B. D is the brother of A. How is D related to B? SOLUTION:
A=Father of B A=\text{Father of }B
D=Brother of A D=\text{Brother of }A
Therefore:
D=Brother of Father of B D=\text{Brother of Father of }B
Hence:
D=Uncle of B D=\text{Uncle of }B
🔵 ANSWER:
Paternal Uncle \text{Paternal Uncle}
🟢 EXAMPLE 24: RELATIONSHIP THROUGH MOTHER QUESTION: P is the mother of Q. R is the sister of P. S is the son of R. How is S related to Q? SOLUTION:
P=Mother of Q P=\text{Mother of }Q
R=Sister of P R=\text{Sister of }P
S=Son of R S=\text{Son of }R
Therefore, R is Q's aunt. S is the son of Q's aunt. Hence:
S=Cousin of Q S=\text{Cousin of }Q
🔵 ANSWER:
Cousin \text{Cousin}
🟢 EXAMPLE 25: FAMILY TREE QUESTION: A is the father of B. B is the brother of C. C is the mother of D. How is A related to D? SOLUTION: A is the father of B:
A→B A\rightarrow B
B and C are siblings:
B↔C B\leftrightarrow C
C is the mother of D:
C→D C\rightarrow D
Therefore, A is the father of C and C is the mother of D. Hence:
A=Grandfather of D A=\text{Grandfather of }D
🔵 ANSWER:
Grandfather \text{Grandfather}
🟢 EXAMPLE 26: SPOUSE RELATIONSHIP QUESTION: A is the wife of B. B is the son of C. How is A related to C? SOLUTION:
A=Wife of B A=\text{Wife of }B
B=Son of C B=\text{Son of }C
Therefore:
A=Wife of C’s Son A=\text{Wife of C's Son}
Hence:
A=Daughter-in-law of C A=\text{Daughter-in-law of }C
🔵 ANSWER:
Daughter-in-law \text{Daughter-in-law}
🟢 EXAMPLE 27: SON-IN-LAW QUESTION: P is the daughter of Q. R is the husband of P. How is R related to Q? SOLUTION:
P=Daughter of Q P=\text{Daughter of }Q
R=Husband of P R=\text{Husband of }P
Therefore:
R=Husband of Q’s Daughter R=\text{Husband of Q's Daughter}
Hence:
R=Son-in-law of Q R=\text{Son-in-law of }Q
🔵 ANSWER:
Son-in-law \text{Son-in-law}
🟢 EXAMPLE 28: FATHER-IN-LAW QUESTION: A is the husband of B. C is the father of A. How is C related to B? SOLUTION:
A=Husband of B A=\text{Husband of }B
C=Father of A C=\text{Father of }A
Therefore:
C=Father of B’s Husband C=\text{Father of B's Husband}
Hence:
C=Father-in-law of B C=\text{Father-in-law of }B
🔵 ANSWER:
Father-in-law \text{Father-in-law}
🟢 EXAMPLE 29: MOTHER-IN-LAW QUESTION: P is the wife of Q. R is the mother of Q. How is R related to P? SOLUTION:
P=Wife of Q P=\text{Wife of }Q
R=Mother of Q R=\text{Mother of }Q
Therefore:
R=Mother of P’s Husband R=\text{Mother of P's Husband}
Hence:
R=Mother-in-law of P R=\text{Mother-in-law of }P
🔵 ANSWER:
Mother-in-law \text{Mother-in-law}
🟢 EXAMPLE 30: COMPLEX BLOOD RELATION QUESTION: A is the brother of B. B is the daughter of C. C is the son of D. How is A related to D? SOLUTION: A is the brother of B:
A↔B A\leftrightarrow B
B is the daughter of C:
C→B C\rightarrow B
Therefore, A is also the child of C. C is the son of D:
D→C D\rightarrow C
Therefore:
D→C→A D\rightarrow C\rightarrow A
Hence:
A=Grandson of D A=\text{Grandson of }D
🔵 ANSWER:
Grandson \text{Grandson}