It seems to be common for people to leave the family home to all the children jointly and just give the carer the right to live there. If that is the case it can often lead to a situation where the other siblings resent paying a share of the costs of a home they can’t get any benefit from and maintenance is neglected. Even if it is inherited in full it can leave the carer unable to fully support themselves if they did not get a chance to establish themselves and save money independently first, again leaving them dependent on the good will of other family members to help them.
Putting people into residential care or paying for home care is hugely expensive, it’s sad that so many people who are carers for family are not valued at even a fraction of what a paid carer would receive and are instead pushed into poverty. We are lucky in Australia that we at least have a carer’s pension available to help (and unemployment benefits if you stop caring), even if it is less than minimum wage. It sounds like some of the people in USA have literally nothing and are completely dependent on the person they are caring for. No matter how horrible a position they are in they can’t stop without becoming homeless.