Correct option is B
In the given question sings and relation is given below-
& → Mother
$ → Son
% → Brother
@ → Father
S & Z $ F % B % E @ G → in this S is the mother Z , Z is the son of F, F is the brother of B, B is the brother of E and E is the father of G. The family tree is given below as-

From the above family figure Z is the son of E’s brother is correct.