Is AUTHOR wrong in the post ? POST : Never liked my Dad much.  He is compelled to rant about politics at every chance, including throwing out the racist N word. Chronic complainer, know it all. Discussion with him is not my interest.   We've always lived in the same places, couples miles apart. 

I help him with his many requests, including transport to a variety of specialist doctors so he can achieve his goal of living to 100 (which he discusses daily).  Included repeated trips out of state, meaning I have to leave my wife several weeks a year.  And fixing his house and all sorts of related things.

He remarried 30 years ago, younger foreign woman for sex (English second language). At this point she prepares his meals, but little else (she is generally ineffectual).  I take him to most of his appointments, help him with all paperwork.  They don't talk much any more; he increasingly sits home alone now that he can't drive anymore.

My pending inheritance (moderate) does create some obligation.  My deadbeat druggie sister and a nephew are getting part of his money, both live in another state; never done anything to assist.  Stepmother is getting the largest chunk.  I assisted in his business in decades past, so some of that compensation is earned.  (the inheritance was all hashed out 8 years ago; it is not debated)

My wife and I have health issues also.  And concerns.  We can't visit our grandchildren out of state because I now need to be near my Dad at all times, in significant part because of my highly ineffectual stepmother can't step up.

It's been a long road--nearly a quarter of a century since my Dad first began needing medical care at 70.   He's had some serious medical issues but is still going fairly strong.  No end in sight, really.  He might outlive my wife, who is in poor health.
 
I find the whole situation depressing and tiresome, sorry to say.  Might be different if I liked my Dad.  I'd like to reduce ties, less time on social visits, less participation on medical trips.  But I'll probably continue the status quo--unhappily.