I don't have any twins in the family, and don't mean to be a downer at all, but my little boy had a twin...we lost him/her at a little less than 5 weeks pregnant. I have always thought about what it would have been like to have two of him or a him and a her. Never thought it would be possible to even have the possibility for me!
The one thing I can't imagine is having two babies weighing in at over 9 lbs at birth though!! That's what he weighed