I have no idea if this form is different across different Authorities, I would assume so, but also assume they must be similar.
My child does not need any boxes ticked for looked after, military, SEND, sibling, staff child etc
There seems to be no other place to tick that it's simply the choice we have made and nowhere for the supporting statement like you did for Primary School Applications.
Is this just that then? You just select and don't need to write reasons?