Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.
Get Legal Aid. You are being screwed for some reason. Living in a bad neighborhood is bad for your mental health. So are arsehole families.
Your mom could disinherit you for any reason or no reason.
BUT, you can sue your brothers and sisters even if you are bipolar because they are alienating your mother from you and consequently your inheritance. They are also alienating your son. You'd have a good case because they are currently letting you live there, so it is not your behavior that is in question, just your diagnosis/disability.
It is likely that if you get an advocate or an attorney, your family will back off and make equitable arrangements.
Would you please provide more information? Are you on SSI or SSDI?