Hi @k-a-s-i-a! I just wanted to comment on this because I had the same problem with my father ;) He came to visit me for 3 months and he was just so persistent about not changing it was incredibly challenging and pushed my buttons on more than one occasion :)
Thing is, it's all about knowledge and understanding. Once we can show people the alternative way or information, they are much more willing to listen and hear the points we're making.
Don't give up, we make little ripples that can turn into a wave when we don't expect it! <3