There are six persons S1, S2, S3, S4, S5 and S6.S3 is the sister of S6.S2 is the brother of S5's husband.S4 is the father-in-law of S5.
S4 is the father of S1 and grandfather of S6.There are 2 fathers, one mother and 3 brothers in the family.
How many male members are there?