I knoooow! And the thing is, when they visit here they complain as soon as I meet them at about how long they've been traveling, how tired they are, etc. But they don't seem to think this applies to me visiting them.

I did a few years ago have to go on holiday with them and that meant a drive about as long, but at least there was a day at home between the plane flights and traveling for the family holiday, and vice versa. Even that, with the day to rest, was so utterly miserable I promised myself I'd never agree to so much travel in such a short time again.