UPSC Prelims 2026 CSAT, question 44

Solution.

Answer: (d) $Q$ is a sister of the husband of $S$

1. $P$ has two children, a son and a daughter, who are $Q$ and $R$.
2. Since $S$ is the mother of $T$ and the spouse of $R$, $S$ is female and $R$ is her husband (making $R$ the son of $P$).
3. Therefore, $Q$ is the daughter of $P$ and the sister of $R$, meaning $Q$ is a sister of the husband of $S$.