Anonymous wrote:OP again. They are coming over to watch the SuperBowl. No babysitting involved. The foam mattress is fine - used to be our bed until we got the king size mattress.
They are old. It probably hurts their backs. You don't know what that is like until you are there. I don't see how someone sleeping in your bed for a night is so terrible. If it bothers you so much, get another mattress for them. Ikea has them for a few hundred bucks, and it will be there before the Superbowl. If you aren't willing to spend that money, AND you can't let them use your bed, you are being petty.