P has a son and a daughter. S is the mother of T. S is R’s spouse. Q and R are children of P. Then how is Q related to S?
Answer & explanation
Answer: (d) Q is a sister of the husband of S
S is a mother, so S is female and her spouse R is male — P's son. P's other child Q must then be the daughter, making Q the sister of S's husband R.
- S is the mother of T, so S is female.
- R is S's spouse, so R is male.
- Q and R are P's two children, and P has one son and one daughter. R is the son, so Q is the daughter.
- Q is R's sister, and R is S's husband: Q is a sister of the husband of S.
Remember · In blood relations, fix genders first from words like mother, son, spouse; then place each person on a family tree.
Question and answer: UPSC's provisional GS Paper II (2026, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·