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Most people will never understand how draining this type of relative can be, because most people are not complete financial fuckwits and they have no experience of just how hard it can be. They think it is just people overspending a little.
I have a relative who has been serially bankrupt, has more than once run up debts in excess of house value, lost a family home by taking out a hidden second mortgage so the kids ended up homeless and living with other relatives etc. This relative now lives in a house owned by another relative, has done for over 20 years, has never paid rent, yet sublets to mates. He does no maintenance, hoards stuff to the point where a floor collapsed and he didn't notice. He cannot be trusted with money and whenever he has cash, he just gives it away without a thought. He just doesn't have the skills to look after himself or a property, but would be deemed competent by all measures. He thinks it is all ok, because the house has (theoretically) gone up in value since he has lived there. He doesn't see that it is not real until the asset can be realised or recognise the impact that financially supporting him has had on his other relative.
The OP's mother protected her major asset for her daughter's benefit. It is HERS, not her father's. She is not proposing to make him homeless, she is trying to make sure he is suitably homed, as my relative did. OP can buy him a flat, make sure the bills are paid etc and not enable him to keep running up debts. This is not about her being heartless. If her father has access to cash, he WILL spend it on whatever his vice is. And then come back for more. Should it be the state's responsibility to home people like him?
Do I care about the creditors? Not really, they are unlikely to be hard up individuals. Odds are that there is gambling or another addiction going on. I struggle to care about bookmakers or others who support addictive behaviour. If it was just excess spending, there would be something to show for it.