K is the daughter of L. M is the son of L. N is the sister of M. How is K related to N?

A. COUSIN

O is the grandmother of P. Q is the mother of P. R is the father of P. How is O related to R?

A. MOTHER-IN-LAW

D is the mother of E and F. G is the father of E. How is G related to F?

A. FATHER

If A + B means A is the brother of B, and B - C means B is the sister of C, what is the relationship between A and C?

C. COUSIN