I think the 50% sibling thing is pretty common- it s generally that level at Fairlawn. Not sure about the best approach as to
not have a sibling policy would make life untenable for parents and the kids- they'd never have time for anything and would probably have a lot of conflicting events. We have children both at school and nursery and it's bad enough; we were thinking of changing nurseries but decided the distance made managing journeys too difficult.

Sympathy to anyone who is left in limbo but places do arise so stick it out and be positive.