Yesterday Will told me that when he grows up he will have twins named Margot and Harrison (some twins he knows)...but not to worry - he will still live at home with us.
I guess this is a step up from when he wanted to have 2 babies, a boy and a girl. They weren't twins, their names were to be Katie and Will, and Katie was the mom. Katie and Will were going to live in Will's room and the babies were to live in Katie's room. At least this time, Katie wasn't the mom although he didn't say who was!