My dad passed away but claimed me on his taxes due to my disability. He was in the military, My mom kicked me out. Do I have any legal action to take

I am a disabled adult waiting on my SSI. My father was taking care of me and claimed me on his taxes. He was a Veteran of U.S. Air Force and was receiving retirement benefits. He passed away but did not set up a trust fund because I'm sure he didn't think my mother would kick me out. She put me in a small place in someone's back yard and has recently told me that as of February I am responsible for half the bills even though she knows I am unable to work due to epileptic seizures and the medication I take. I need to know if I have any legal action I can take, if so, what is it and how do I go about doing so. I hope this all makes sense . I get confused very easily due to my condition