How can I marry my fiance and not the family?If at all possible

My fiance is the most wonderful thing to have ever happen to me beside our daughter. Then I wonder to myself were he came from because his family is the complete opposite of him. They're not open to any decisions unless it's theirs and it doesn't help that we're living with them (waiting to get approved for our house). So it's a constant, keeping my mouth shut on stuff I don't agree with and it's their way or your just S-O-L. Can't wait to move but until then how do I keep myself from getting stressed out all the time with constant yelling and bickering at each other (his mom and her husband). HELP !!!