A family consists of six members P, Q, R, X, Y, Z.
Q is the son of R but R is not mother of Q.
P and R are a married couple.
Y is the brother of R, X is the daughter of P.
Z is the brother of Q.
Which symbol represents all the children of P?
(1) QXYZ
(2) QXZ
(3) XZR
(4) QZ
