P is the father of R and S is the son of Q and T is the brother of P. If R is the sister of S, how is Q…

Tracing the family relationships step by step: 1. P is the father of R. 2. R is the sister of S, which means R and S are siblings, so P is the father of both R and S. 3. S is the son of Q. Since P is already identified as the father of S, Q must be the mother of S (and therefore the wife of P). 4. T is the brother of P. 5. Since Q is the wife of T's brother P, Q is the sister-in-law of T .