Concept:Use a family tree and blood relations to find how X is related to W.Explanation:U is the father of Z.Y is the sister of Z, so Y is also a child of U.Y is married to W, so W is Y's husband.V's mother is Y, hence V is Y's child.X is the brother of V.So X and V are siblings, and their mother is Y.Since W is married to Y, W is the father of X.Therefore, X is the son of W.