Free Blood Relations MCQs with Answers

1. A is the brother of B, B is the sister of C, and C is the father of D. How is A related to D?

• A. Father
• B. Brother
• C. Uncle
• D. Cousin

Explanation: A and B are siblings, and B and C are siblings, so A and C are also siblings. Since C is D’s father, A is D’s paternal uncle.

2. Pointing to a photograph, a man said, "She is the daughter of my grandfather's only son." How is the woman related to him?

• A. His mother
• B. His sister
• C. His aunt
• D. His niece

Explanation: The grandfather's only son must be the speaker's own father, so the woman is his father's daughter, which makes her his sister. The chain is easiest to follow by resolving the innermost phrase first and working outwards. Answering aunt comes from treating the grandfather's only son as an uncle, which the word only rules out.

3. Pointing to a photograph, a man said, "He is the son of my grandfather's only son." How is the man in the photograph related to him?

• A. His father
• B. His brother or himself
• C. His uncle
• D. His cousin

Explanation: The grandfather's only son must be the speaker's own father, so the person in the photograph is his father's son, which is either the speaker himself or his brother. Working inwards from the innermost phrase is the reliable technique. Because only one son exists, no uncle or cousin is possible on that side.

4. A is the mother of B. B is the sister of C. D is the father of C. How is A related to D?

• A. Sister
• B. Wife
• C. Daughter
• D. Mother

Explanation: B and C are siblings, so they share the same parents, and since A is the mother and D the father of that pair, A is D's wife. Drawing a simple family tree with one horizontal line for each generation makes this immediate. Sibling links always point back to a shared set of parents.

5. If P is the brother of Q, and Q is the daughter of R, how is P related to R?

• A. Son
• B. Brother
• C. Father
• D. Nephew

Explanation: Q being R's daughter makes R a parent, and P as Q's brother shares those parents, so P is R's son. The gender of P is given by the word brother, which fixes son rather than daughter. Watch that the question asks how P relates to R and not the reverse.

6. Pointing to a woman, Ali said, "She is the daughter of the only child of my grandmother." How is the woman related to Ali?

• A. His sister
• B. His aunt
• C. His mother
• D. His cousin

Explanation: The grandmother's only child must be Ali's own parent, so the woman is that parent's daughter, making her Ali's sister. The phrase only child rules out any aunt or uncle, which in turn rules out cousins. Resolving the innermost description first is again the key step.

7. A is the son of B. C is the daughter of B. D is the brother of B. How is D related to A?

• A. Father
• B. Uncle
• C. Brother
• D. Grandfather

Explanation: A and C are B's children, and D is B's brother, so D is the paternal or maternal uncle of A depending on B's gender. Since B's gender is not stated, the relationship is still uncle either way. The sibling of a parent is always an uncle or aunt.

8. X is the father of Y, but Y is not the son of X. How is Y related to X?

• A. Daughter
• B. Nephew
• C. Niece
• D. Cannot be determined

Explanation: If X is Y's father then Y is X's child, and since Y is not a son, Y must be a daughter. Puzzles of this shape exist to catch the assumption that a child is male by default. A nephew or niece would make X an uncle rather than a father.

9. Introducing a man, a woman said, "His wife is the only daughter of my father." How is the man related to the woman?

• A. Brother
• B. Husband
• C. Father in law
• D. Uncle

Explanation: The only daughter of her father is the woman herself, so the man whose wife she is must be her husband. Substituting the speaker for the description as soon as it resolves prevents confusion. The word only is what guarantees the identification.

10. If M is the sister of N, N is the son of O, and O is the mother of P, how is M related to P?

• A. Sister
• B. Mother
• C. Aunt
• D. Cousin

Explanation: N and P are both children of O, and M as N's sister shares those parents, so M and P are siblings and M is P's sister. All three belong to the same generation, which rules out aunt and mother. Grouping people by generation first is the fastest way through these chains.