I have had a chat with my son and he is very supportive. He understands what we have been through as a family and doesn't want me to be excluded.

It would seem his future MIL is acting (with best intentions for her daughter and my son) because she wants everyone to get on. I have tried explaining to her but she doesn't understand really.

He is going to ask her not to bring the subject up again. I hope she takes notice this time.

Thanks for all your replies and support. I really appreciate it.