I realise this sounds really wanky, but DS doesn't live in a traditional set up - Mummy, Daddy, child(ren). And yet most of his books seem to depict this. Our family isn't that untraditional, just me (Mum), DP (Not his Dad - DS uses his name) and DS, but I'd be interested in any books which have anything different to the norm, whether that's a single parent family, living with grandparents, gay parents, whatever. Particularly stepfamilies, but any would be good.
Not really looking for the kind of "Let's explain this situation" sort of books like you get when you're expecting DC2 or whatever, just books which have non-traditional families without comment, just as part of the background.