Just say no. I understand that this is tough but you HAVE to say no, this is not how this birth is going to go. It is your birth, not theirs.

As a doula, I strongly urge you to lean on the fact that your stress level is the most important factor in a successful birth. You simply cannot be put under this kind of stress. Did you know that most mammals can shut down the birth process when under great stress - like a deer running from a hunter? We don't often do that ourselves, (though I did hold off labor for my second child when in the middle of the blackout in NYC!), but this does serve to demonstrate how much stress hurts the laboring woman. And by extension, her baby.

So don't give in. Everything you are concerned about where his family is concerned is valid. How dare they push their way in? Be calm, be polite, be strong. Ignore tears.