My father has blocked me out of his phone so I can't call him or my mom. I live in LA and they are in mass. He is very verbal abusive to me and my mom has some dementia. He is very upset because I live here, he holds on to much of the past and dose not let go. I hove no siblings. Some family members back there but he evens finds flat with many of them. There is so much more, but don't what to go on an on about this.
If he's being physically or verbally abusive to your mom, not providing her access to proper food and medical care, then you may have a case for Adult Protective Services. Good luck.