Thanks everyone. I did speak to my mum eventually and said that perhaps her timing was a bit crap. I don't have anything against her fostering (apart from the fact that as kids we got pushed aside for the 'other kids', it's her job and all that, but I do think she could have waited until after Christmas. After all she has 2 daughters due to give birth within a week of each other very soon and she could well be needed, but now she has this little boy she will be very limited in the help that she can give. And, knowing my mum as well as I do, I do still think that she deliberately asked for a foster child before Christmas so that she would have the perfect excuse not to help.
I don't really need her help thankfully, when I left home I made sure that I was self-sufficient and only once have I ever asked her to do something for me. But my sister is very reliant on family, having no in-laws to turn to, and I do feel sorry for her when mum makes comments such as "you don't need your husband to be there when you go into labour, I never had anyone with me when I gave birth!" It's a bit mean and I can see why my sister is so upset.
So I did outline my feelings to my mum, but in a humourous way as she had all her defences up. She actually said she would "tear herself in two for her children" which is laughable as that's the one thing she would never do! She has never been there for me when I have really needed her, why is why I don't call on her for help anymore, and she has not been there for my other two sisters' either. But I made my point and so the conversation ended amicably.
I think I will take Aloha's advice though, these are not my problems and I shouldn't be dragged into them. It's not fair for my sister to be phoning me and laying all her problems onto me. She spoke to me again today and even though I have said that I will stay overnight with her children if she goes into labour, as has my other sister and my brother, she told me that she's told her HV and MW that 'her family' will not help her when she goes into labour, so the HV is actually suggesting inducement so she can plan the arrival! So when I do offer help, it's just thrown back in my face! My family are very complicated, but my mum and my eldest sister take the biscuit when it comes to selfishness, paranoia, negativity and self-absorbsion. I do think that both of them demonstrate characteristics of Munchausen's (can't spell it!).
I have never once phoned them to complain about my depression, they know about it, but they haven't shown much concern about me. I haven't troubled them with my worries at all, so I'll be damned if I'm going to let them dump all their problems onto me. It's their problem and they can bloody well sort it out amongst themselves. I've offered my help and if I'm not taken up on it then so be it. I can't even remember the last time either of them offered me any help!
So I've instructed dh to answer the telephone in the evenings and to tell them that I'm busy. If they do manage to get hold of me, I'll always be just going out! I have 3 weeks to go before the due date and I want to remain as calm as possible. I'm crapping myself over the birth as it is! But everything is now prepared and if I go into labour after the weekend, then it will be classed as term. I am being over-sensitive these days and I just can't wait to get back to normal!