Too many parents are willing to be blackmailed by their kids. Older parents with grown kids need to be willing to look at them as say, "You aren't God! I don't worship you and I don't OWE you SQUAT! You want to go live with the pigs? Have at it. But remember: You may "cancel" me, but someday you'll face God Almighty and He'll be the one doing the cancelling!"
I am and was perfectly willing to be cancelled by my kids. And its sad, because the world has NOT been kind to them as a result.