Have given, Condition (1) ⇒ A @ B = A is the father of B. So E@F = E is the father of F. Condition (2) ⇒ A # B = A is sister of B. So G#H = G is sister of H. H is male, so G is female. Condition (3) ⇒ A! B = A is the son of B, So F!G = F is the son of G. Because, G is female, so G is the mother of F and father is E. So H is E’s wife’s brother.