S is the husband of D. D is the sister of A. D is the daughter of B. Q is the daughter of B. R is the husband of Q. N is the daughter of Q and R. (2) N is the daughter of Q andR. R is the son of M. M is the paternal grandfatherof N. Therefore, V is the maternalgrandfather of N. Q is the wife of R. Q is the daughter of B. B is the mother of Q. Therefore, B is the mother–in–law of R.