I have a friend who had twins three months ago. She also has a son who is just a couple months older than my youngest. He comes to play with us every once in a while to give her a bit of a "break" (though you can't call it that unless she has someone watching the twins too). Yesterday we picked him up to play because it was her birthday and she and her hubby were going to spend some time together (she'd arranged for someone else to have the twins, I can't fit that many kids in my mini-van).
Life is a lot of work, but boy is it sweet!