I did spend a lot of time with my Mum during my third trimester but then again, I'd spent a lot of time with her before and still now, I see her almost daily so I guess that is just our relationship. That sounds really intense but she isn't interfering or anything, more like a good friend and I enjoy talking about our days together plus she helps entertain DD while I get dinner sorted (she drops by on the way home from work) which is really helpful as a single Mum. Anyway, getting way off track but at any rate, I don't think there are any rules -- you just go with how you feel!