just wondering as im one of 4 and i have 3.dd-7.ds-6 and ds2-2.normally dd and ds2 are always together or its dd and ds1.and if d isnt here(she has amazingly busy social life for 7 year old!)ds1 and ds2 get on brilliantly which they dont if shes here.is this because theres a middle one,odd number or just the way boys are?would a fourth make a difference.myself and my sisters all got on,we did fight and fall out but there was always 2 of us.if you see what im going on about!