s paternal aunt. - In English kinship terminology, the husband of one's aunt (father's sister's husband) is an **uncle** (paternal uncle-in-law). **2. Option Analysis**: - **Option (A) [the grandfather] is INCORRECT**: Two generational steps separated; here there is only one generational step. - **Option (B) [an uncle] is CORRECT**: Paternal aunt's husband is canonically classified as an uncle. - **Option (C) [the father] is INCORRECT**: $Q$ is the father of $S$, not $T$. - **Option (D) [a brother] is INCORRECT**: Different generation. **3. Final Answer**: - **Correct Choice**: **B**", "url": "https://gate-bt.thinkextra.in/pyq/gate-bt-2022-q4#solution", "author": { "@type": "Organization", "name": "ThinkExtra GATE BT Editorial Board", "url": "https://gate-bt.thinkextra.in" } } } }