My nana is pulling my family apart! My parents fight because of her! HELP!?

My nana is ******** sick. She tries so hard to turn me and my brother away from my mom and dad and to get us to live with her. Everytime she does this she causes a huge thing in my house. My mom and dad are literally DIEING of depression. Shes such a ****** i dont get why someone who is supposed to love and help her family is doing this to us. My nana did it this time and my parents aren't even talking to each other and hardly talking to us kids. They aren't even sleeping in the same beds tonight. I can't handle this anymore. My parents love each other and if this keeps happening then i just know they'll get a divorce and it will be all her fault! I'm crying as i write this because our loving family is being torn apart. We've tried everything to stop this and nothing works! We talk about moving far away but we never even do anything about it. Please help! I don't want my parents to get a divorce my life would be RUINED! my ******** perfect world would suck. I would want to kill myself. What can we do?! PLEASE HELP! >:(