As per Audax's suggestions with the emails, I would just set up my filter to automatically delete them.

Unwanted baby advice is a toughie b/c people will give you any advice they see fit. I'd probably just acknowledge her suggestion and that is it.

I don't call my IL's 'mum or dad' - I was with my DH for 7 year before we got married and I always called them by their first name, so I was not about to change once we got married. Can you call her something else that is sort of 'mum' term but not mum? Again, Audax has made a great suggestion!

GL