Question

In the family of three generations, there are eight

members J, K, L, M, N, O, P and Q. O is the father of L and M. L is married to Q, who is daughter-in-law of K. K has only one son and a brother, N. P is married to J, who is the mother-in-law of K. Which of the following statement is definitely true?

A J has two sons

B L is the sister of M

C M is the nephew of N

D L is the grandson of P.