Shared property with divorced parents / father with issues

Hi,

It took me quite some time to seek for help and be able to talk about this. I apologize if I make mistakes in English, since I'm a Spanish speaker.

My father was verbally and physically abusive with me when I was a child. He beat me many times until I peed, called me names and I grew up promising myself I would never let that happen again. My mother never intervened "enough". He kept doing that even when I was a teenager, until they got divorced for different reasons - not the ones I mentioned.

With the divorce, they kept a shared property that they were never able to sell. 20 years have passed and my mother is not in her best condition now, mentally nor physically. She is unable to understand much of what's going on and she is unable to get her share of the property because my father keeps putting sticks on the wheel when someone shows interest to buy it.

The biggest problem is that my father clearly shows severe mental disorders, which I can't really tell what they are. I know he lives in the property and the house is full of trash, he barely takes showers and no one can enter the place and clean it. He doesn't clean. He doesn't have hot water, nor gas to cook. He lives in the worst conditions without really needing to.

I'm worried about my fathers health, he is overweight, has a terrible hernia on his stomach that needs surgery and as expected he is not taking care of it. Besides that, my mother is still involved with him because of the property she shares with him and he doesn't cooperate to sell.

I had a discussion with him today, confronting him about this and other past issues. He sent me some suicidal messages saying he won't bother anyone again anymore. I was scared about it and contacted my uncle and other family members, and they told me not to worry, because this is not the first time that he takes this attitude.

I can accept him destroying himself, although I would like him to find help. The problem is that he won't accept reality and keeps avoiding any talk about this. The real problem is that my mom is not ok and she wants to sell the property to enjoy life, at least now, with the money that she may earn from her share of it.

What do you recommend me to do? Do you think my father may accept help? Do you think I can press somehow so my father will accept selling it? I know if I involve a lawyer in this issue, they may lose most of the value of it... which doesn't make much sense.

I really don't know what to do. This is a huge problem and I don't know where to start.
Appreciate any help or advice.