Solution:C is a female,E is a female.
D is the father of A and grandfather of F.
Therefore. A is father of F.
Thus. D and A are the two fathers.
C is the sister of F. Therefore, C is the daughter of A Since, there is only one mother, it is evident that E is the wife of A and hence mother of C and F. F is the son of E and A
B is brother of A.