girl's father in law is the father of boy's father in law so what is the relation between boy and girl

Question

P is the father of Q and S is the son of R.
T is the brother of P and has a daughter U.
If R is the sister of P,
then what is the relation between U, Q and S?

Answer 1

Boy's father in low's father is girl's father in low, so boy's father in low is girl's husband. Girl is boy's mother in low