In need of opinions

I just need some opinions. I feel like I'm stuck in a hole. I'm not here to get any criticism.. my boyfriend and I have been together for a little over a year. We have our own house together, and started our little family off with a couple pets. Recently we've both found out that I'm pregnant. We werent necessarily trying, but we werent using protection either. My boyfriend is the sweetest, loving, and most gentle man I've ever met. But here's the ass kicker... his family doesn't like me. They show me nothing but disrespect. They have called me trash, and other names. I have shown them nothing but respect, and even went out of my way to do things for them. My question is.. how do we (my boyfriend n i) go about telling them in a calm mannor that I'm pregnant?