I am not there so cannot say. From your side it seems they are just trying to get a rise. Sadly this does happen. And this is not just a bipolar thing. I have a near and dear friend this way and we are very understanding because we both have issues. My family does this even if "healthy'. All I can say is let go. May not have to be permanent. Just let them know they cannot use you as a door mat. I know it hurts but it does work out.