36, 1, 1: Wrong, 36 is too old to be called a boy.
18, 2, 1: Could be.
12, 3, 1: Could be.
9, 4, 1: Could be.
9, 2, 2: Could be.
6, 6, 1: Questionable, there is no single oldest kid.
6, 3, 2: Questionable, 6 is too young to be playing drums (is it?).
Still many solutions left. Unless the youngest two happen to be twins, then there is only 1 possibility: 9, 2, 2.