Answer the questions based on the information given below. Nine persons Q, R, S, T, U, V, W, Y and Z live in a family of three generations. V is married to S. W is the son of S and sibling of Q. Q is the mother-in-law of Z. R is the only grandchild of S. R is a male member. T is the son of Y and father of R. S has two married children. How many male members are there in the family?