P is the father of Q and R. If S is the wife of R, then what is P to S?

P is the father of Q and R. If S is the wife of R, then what is P to S?

Explanation
  • P is the father of Q and R.
  • S is the wife of R, meaning R is S’s husband.
  • Since P is R’s father, he becomes S’s father-in-law.