Well my old dad is still as cantankerous as ever.
I suppose at 92 he is a little entitled to be a pain and wind people up, but why is he so well behaved with strangers and rarely seen family members?
The people he spends the most time with are the ones he winds up the most. Is it just familiarity breeding contempt? Or is it because we see him the most we get all of the stick. (Probably not deliberate on his part).

Caring for an elderly relative is not all fun.
It’s tying, mundane and not very rewarding.