I'll pretty much agree with what everyone else says--it's really hard to have a relationship with someone when you really can't stand their family. Many moons ago, I had the same problem...it's especially dicey if his mum is a redneck and his dad acts like he's 45 going on 14...nothing against rednecks, but there's only so much you can take, especially if they all think you're a "prep."
Luckily, I love my boyfriend's family...they're crazy, but they remind me of my own family so that just makes me appreciate them more.