DH and I are desparate for the occasional eve out but lack a babysitter. DS1 is 14.5 and quite sensible, would it be reasonable for him to 'look after' has 12 yo brother for a couple of hours in the evening every now & then? Say approx 8-10pm. Or should we employ an adult sitter, can't see the point of employing a 16 yo, DS1 would be appalled & embarrased if it was a girl!!