(soz OP, but it actually should be too much)
I had a family relative look after a old woman(on her husband's side) with acute Alzheimer's. It really took it out of her, she basically had to give up her entire life, work, hobbies, everything for the years she looked after her. A few years in she became noticeably more depressed and she changed as a person. You could see the burden she was under.
Looking after dying, demented elderly is thankless, fruitless, nasty, all consuming work. To be honest with cuts in respite care, it's only a matter of time before someone somewhere is found having murdered a demented elderly relative.