Im having same problem with my dad whos 84 he has mild Parkinsons and other health issues copd etc.
My mum has cancer, we have just had to have crisis care team in, prior to that she was up n about..anyway snce this virus I have tried to tell my dad he must!! wash his hands more, because I have been spending 24/7 at my mums I have notice how little he washes his hands.even after going to toilet!
We have repeatedly said he must wash when he comes back in the house after going pub or shop.We drop hints about how germs are spread etc but he gets so aggressive!! he has always had an aggressive nature,if we mention "have you washed your hands " in even a joky manner and sang happy birthday he gets angry "!
To think he goes n makes my mum a bite to eat is worrying .
I wipe down what I can, I then say Oh I will just wash my hands...!! but it makes no diff,.
I suppose we will have to just keep fingers crossed, he is of an old school where "a bit of muck never harmed you"!! I know what your up against.!! good luck.