Son-in-law tried dragging her: that didn't work. In the end he had to carry her.
George, meanwhile, was quite happy to get in the car and go home with them. I did suggest swapping but Daughter and Son-in-law weren't too keen on that idea. I don't know why.
They think it's because Holly doesn't like the long car journey but we know it's really because she doesn't want to leave George whom she loves (even though she pretends to merely tolerate the young rascal).