And why is Grandpa still allowed to see Taylor?
The consequences would be FIL shoved forcibly out the door and the good-bye would be "You are Dead to me." And, "You are a cruel, big, fat liar!" would be said beforehand and in the child's hearing.
This would be both assault and retaliatory rudeness.
Far better would be to tell him to leave in a cold, civil manner without resorting to insults.
Minus the shoving, I think FIL's behavior has gone past the point of deserving polite behavior from Taylor's parents. Perhaps calling him a big fat liar while telling him to leave would give him the clue by four he so desperately deserves.
The reason I disagree is that getting rid of grandfather in a cold, civil manner would provide a good example to the little girl of how to deal with difficult people in the future.
One could argue that "we don't allow people to torture us for fun" is a good lesson on how to deal w/ difficult people.
BUT, on the other side of that, I had a grandfather not a lot different than the grandfather in the story.
I was 7ish when I got my ears pierced and he (he had 'kinda' been a pastor years before--long story) told me "you can't go to heaven now, if God had wanted you to have holes in your ears, you would have been born with them".
By age 7, I knew that grandfather was a teaser/liar/challenging person and I didn't believe him and just turned on my little heel and told my mom. (who pulled him aside, read him the riot act again, but didn't kick him out that time because she didn't want me to feel punished for 'telling'--FTR, he didn't believe what he was saying or that may have been handled differently).
But, honestly, even though my story had a nice implied 'you're going to hell' lesson in it, it seems less mean than "sure, you can go to disney with us...oh wait, HAHAHAHAHA"
I think I'd also get grandfather these for christmas: http://www.stupid.com/fake-lottery-tickets.html