Gosh Kerry, your in-laws are pushing you on various fronts. I cannot imagine having anyone in the birth room with me except DP. Thank god no-one else is mentioning anything (my mum jokes with me about how she plans on setting up a garden chair with a nice view of you-know-what but really she wouldn't want to be there).

If your SO insists that he's going to bring others in as he pleases then it sounds like he needs to be banned, too. Do you have a really close girl-friend that could be with you if necessary (i.e. if you decide not to have SO there)?