I live in a home with my grandparents. I moved there because I couldn't afford my own flat anymore. They have made it very clear to me I am just a tenant. I am blatently disregarded, I am blatently lied about, I am ignored. They make me feel extremely unwelcome. I have been living like that for nearly a year.
You have got to learn to control yourself. You have got to learn to let go of certain expectations - yes it bloody well hurts like hell. You have got to grow a very thick skin. You have got to let go of the ego (when it comes to asserting your rights etc) You keep the peace in the home. You have got to learn to suck shit up and go about your day. You are polite when they are in your space and you can converse if they wish. You don't cause a fuss. You make sure you stay out of the way. You keep your nose clean.
It's not easy - not at all - but you know what - I have grown such a huge amount. I am in control of myself. They can say what they like and they do - I won't crumble, I won't fall, simply because of the way they have treated me, they have made me stronger.