Question

P is father of r and s is son of q. t is brother of p. if r is sister of s, how is q related to t?

Answer 1

if r is the sister to s then it means  q is the mother to r and s, therefore p and q are married couples, therefore if t and p are brothers and q is the wife to p that simply means that t and q are brother and sister in law to each other respectively.