From what little I know on the subject Scott is correct. Although sextuplets are quite rare, fertility treatment can often result in multiple births. Also, the fact they already have twins would make this even more likely. I'm sure the parents were well aware of this but 6 might be a little more than they bargained for.

It's no business of mine but as this couple already have 2 young children I wonder why they would need fertility treatment anyway. It's always struck me as an unfair twist of fate that people who deperately want children are often denied them while so many that don't want a child seem to have no problems at all. Nature works in mysterious ways.
