Hmmm...very interesting. From what I've seen in Kate's family tree, no twins, but who knows? There could be twins going way back in Kate's ancestry/family tree! Obviously, having a history of twins would definitely increase chances. Ceratinly would be an interesting event IF she is having twins. I've also seen alot of people asking "If she has twins, who will be first in line?" and answer is simple. The elder twin!
In other news, William arrived to see Kate at the hospital at 11:30am this morning.