My father is in assisted living and my mother at home with early onset cognitive dementia. My brother is trying to get hold of their savings. I have reported to fraud at bank. Bank is going to release the funds to my mother's address because bank wants no part of dispute. My brother will have my mom sign it over to him and he will bank it. In order for him to cash the check, does he need my signature also? Or just my parents? I need one more Dr. letter to remove my parents, but I am out of state and very hard to do.