My mom and I co-own a home, she has now hired a lawyer to force a sale. What can I do?

My mom and I have lived together ever since we got the home and I have been paying 75% of the mortgage and all the bills for the last 10 years. However, due to a recent stroke, my mom is no longer independent and now needs assistance for basic necessities (like showers) and high falling risk. This event has caused my siblings to have a sudden interest in her ownership stake of the home and have basically "helped" my mom hire the lawyer that is currently forcing us to sale. The problem? My siblings are not looking out for our moms best interests! Instead, plans have already been made for my moms chunk of the money to be used for a brother that is currently serving life in prison and no one has thought of her current needs. As it is right now, I have been left with the task of doing most of her care and the only one worried of what will happen to my mom if my siblings leave her broke and homeless. What can I do?