P is married to M. W is the wife of S. G is the daughter of A. M is the mother of S. A is the sister of P. How is P related to W?

Correct — C.
Rule: a woman's husband's father is her father-in-law.

M is the mother of S, so M is female, and P, married to M, is S's father.
W is the wife of S, so S is W's husband.

P is the father of W's husband → father-in-law, option (c).
The statements about A and G never touch the P–W link.

Why the others are wrong

• (a)
  Daughter-in-law — Daughter-in-law runs the relation backwards: W is P's daughter-in-law. The question asks what P is to W.
• (b)
  Son-in-law — Son-in-law would make P the husband of W's daughter. P is married to M, the mother of W's husband, so he stands a generation above W, not below.
• (d)
  Mother-in-law — Mother-in-law is M's relation to W, not P's. P is M's husband, so he is male.

Solve a relation chain by fixing genders first, then placing generations.

M is a mother, so female, and P, her husband, is male. S is W's husband, so male. P and M sit a generation above S, and S is married to W, so P is the father of W's husband: her father-in-law.

Key facts

• A woman's husband's father is her father-in-law, and his mother is her mother-in-law.
• She in turn is their daughter-in-law.
• A son-in-law is the husband of one's daughter.

Common traps

• Answering the reverse relation: W is P's daughter-in-law, but the question asks what P is to W
• Giving M's relation to W, mother-in-law, instead of P's
• Spending time on A and G, who play no part in the P–W link

No directly related past PYQ was found.