A is the brother of C.

A is the brother of B, and B is the sister of C, so A is also the brother of C.

A and C are parents of B.

A and C are siblings since A is the sister of B and C is the brother of B.

D and F are siblings.

F is the brother of E, making F the uncle of D.

F is the parent of E, making F the grandfather of D.

G is the brother of H, making G the uncle of I.

G and I are parents of H.

G is the sister of H, who is the father of I, making G the aunt of I.

I is the husband of H, making I the father of G.

J is the brother of K, making J the uncle of L.

L is the mother of K, making L the wife of J.

J and L are siblings.

J and L are both children of K, making them siblings.

Sarah is the mother of Mary, making her the grandmother of John.

M is the brother of N, who is the mother of O, making M the uncle of O.

O is the mother of N, and since M is the father of N, O is M's wife.

M is the grandfather of O.

O is the parent of N, making O the grandfather of M.

P and R are both children of Q, making them siblings.

P is the mother of Q, and since Q is the sister of R, P is also the mother of R.

U is the parent of T, making U the grandfather of S.

S is the father of T, and since U is the sister of T, S is also the father of U.

S is the mother of U.

U is the sister of V, making V the aunt of T.

V and X are siblings.

V and X are the parents of W, making them husband and wife.

A is the grandmother of Y.