Ooo, you are living in a country full of Nazi people(probably not anymore), they all fled to South America when the war ended. They killed so many people here and then made a new life on another continent and forgot all the bad things they did.
Late-stage dementia is really painful. People live in the past, thinking they are still young and asking for their parents. You must never say that it's not true and that they are demented. You always have to play along and try to change the subject after a few minutes. I read a lot of books because I was really interested in how to work with people who have such severe dementia. When I saw some workers trying to tell people that what they believed wasn't true, and they started crying, it was so hard for me. So, I really had to learn something. You shouldn't take away from someone who lives in the past and is still somehow happy by telling them it's all a lie.
As you said, relatives often forget about their own parents. You wouldn't believe how many people never receive visits from their relatives. One woman asks for her daughter daily, but her daughter told us she will never come to visit. When she was a little girl, her father abused her, and her mother didn't do anything, and she said she will never forget. When we called her to say her mother was dying and asked if she wanted to say goodbye, she just said, thank you, I won't come. I've seen a lot in this profession and heard so many stories.
Oh, I'm 32, and when I see kids 10 years younger than me, I say, those kids are nothing like we were, playing outside, not having computers, and then I always laugh. What the hell is wrong with me? I'm saying words that my parents always said to me!
So, if I find someone willing to bite you, I'm sending you a message. I'm more of a werewolf kind of type. ;)