'They fuck you up, your mum and dad / They don't mean to but they do' wrote the great man in 'This be the Verse' (and no surprise, given his mother's mental fragility and a father who had to be asked to remove the Nazi decorations from his office in the Town Hall after war broke out).
But it turns out, from this fascinating article which draws on a lot of good sociological work, that it's the kids who mess up their parents: apparently having a child doesn't make you any happier, and having more makes you more unhappy.
Oh dear. I'm the oldest of six. I've always known we're five too many.