I have had exactly the same with an elderly step cousin. Daughter died some years ago, son lives in Europe, visits once every 6 months apart from lockdown. Step cousin is rude,tyrannical and generally ungrateful, her constant moan being " no one cares,neighbours and family used to look after everyone, they did it for a smile and a thankyou". There are 6 of us who keep an eye on her, shopping, changing her bed, helping her with any paperwork or emergency repairs.After a bout of pneumonia she had carers, they were an enormous help as they got her washed and dressed every day- despite her protests,I'm pretty sure she had stopped washing herself in the previous weeks.The care was a free service for 10 days when she came out of hospital.She argued with doctors and social workers, shouted and raged at everyone because she refused to pay for any care, didnt see why she should ' as they are already paid'. ( Doing this she actually managed 5 weeks free care by putting the agencies in a very difficult position,despite us trying to make her see reason. She can afford care,her goal in life is to keep every penny to leave to the son living abroad)None of us who help out are spring chickens- her grandson is younger , but ill himself with a serious heart condition,and who puts up with much abuse including her attacking him with her walking stick recently! The doctors and social workers say she is compos mentis, and yes I would agree, but her expectations of continuing free care from neighbours and distant relatives are unreasonable.I went through agonies of guilt,but after a difficult 2 months while she was recovering from pneumonia, plus 2 years of running after her during lockdown,I have had to back off for my own sanity and health. I did have a nasty cold to start, and wouldn't risk giving it to her. She hasn't once rung to see how I am, just moaned to others that I haven't been round.I really can't face going back at present. And what of her son in Europe....?" I can't look after mum, we would kill each other..." ?! He is quite content living the life he wants, but to me his mothers care should be his responsibility.