M is the father of N who is the son of V. In order to know the relation of M to P, which of the statement/statements is/are necessary?
1. P is the brother of V.
2. The daughter of N is the granddaughter of V.

M is the father of N and N is the son of V.
Hence, V is the mother of N.
From (1), P is the brother of V
Therefore, M is the brother-in-law of P because V is the wife of M.
From (2), the daughter of N, is the granddaughter of V. From this we do not get any relation of M to P.