I have a 4D scan coming up, my mum and dad are paying because its my birthday present. I don't know whether to invite MIL, I don't really want to. As she never puts towards anything, and I'll feel a bit unfair on my parents paying whilst she doesn't even pay for a picture. Never has either. Shall I mention it, and see if she says anything or just leave it? She will think I've hid it on purpose. She has been to all the others, so missing this one shouldn't be a big deal. But it will because my mum is going and she'll hate that.