I know this is probably going to sound really dumb but I've thought about it for a while.
My own parents were never what you could call 'parental', and both me and my (much older) sister really feel a loss from not having any real family apart from each other, and now our own children. And as we've lived continents apart for many years, our own relationship isn't obviously as close as it could be. So I was thinking... surely there must be some older people, say in their 50s or such, who either didn't have children or feel lonely? And occassional visits and stuff from a ready-built set of 'kids' and 'grandkids' would help them too?
It's possibly the daftest idea ever, but surely I can't be the only one really feeling a void from this.