P son Q is married to R. R sister S is married to T, who is the brother of Q. How is S related to P?

Introduction / Context:
This blood relation question involves two marriages inside one family. P has a son Q who marries R. R sister S then marries T, who is the brother of Q. The problem asks how S is related to P. It tests whether you can follow marriage ties and identify in-laws correctly.

Given Data / Assumptions:

• P has a son named Q.
• Q is married to R.
• R has a sister S.
• S is married to T.
• T is the brother of Q.
• We assume a standard family with siblings sharing parents and marriages forming new in-law relationships.

Concept / Approach:
The approach is to place P and P children first, then add the spouses. Q is clearly one son of P. Q has a brother T, so P has at least two sons. When T marries S, S becomes the wife of a son of P. The wife of a son is always a daughter-in-law of the parents of that son.

Step-by-Step Solution:
Step 1: P is the parent of Q, and Q is male (described as P son).Step 2: Q is married to R, so R is the wife of Q and therefore one daughter-in-law of P.Step 3: R has a sister S. So S and R are two sisters in the same generation, daughters of some other parents.Step 4: S is married to T. Since T is the brother of Q, T is another son of P.Step 5: Therefore S is married to T, P son. This makes S another daughter-in-law of P.Step 6: The question asks, "How is S related to P?" So S is P daughter-in-law.

Verification / Alternative check:
Use concrete names. Let P be Parul. Parul sons are Q (say, Qasim) and T (say, Tarun). Qasim marries Riya, who has a sister Siya. Later, Tarun marries Siya. From Parul point of view, Riya and Siya are both wives of her sons. Hence both are daughters-in-law. Looking at Siya in particular, she is clearly a daughter-in-law of Parul, which matches the reasoning.

Why Other Options Are Wrong:
S is not P sister because they are in different generations. S is not merely P sister-in-law, as that term usually refers to a sibling of a spouse or the wife of a sibling, not the wife of a child. S is not P cousin or aunt either; both of those belong to another part of the family tree. The specific and correct in-law relationship for the wife of a son is daughter-in-law.

Common Pitfalls:
Some learners get distracted by the presence of two marriages and think S must be related through R instead of through T. While S is indeed R sister and Q sister-in-law, the question is about S relation to P. The clearest path is through T: S is the wife of T, who is P son, making S a daughter-in-law of P.

Final Answer:
S is related to P as a daughter-in-law.