So I just found a possible mistake- In the little character blurb, anyway.
Chelia's last name is Blendy just like Sherry's, but they are cousins, not sisters, and more than that they are related by their mothers, not their fathers. When someone marries they take the last name of the father, not the mother.
I mean I suppose it could be that neither of their mothers were married, or that the girls chose to take their mothers' maiden name, or that both husbands chose to take the mothers' last name instead of keeping their own, but that seems unlikely, especially for that to be the case with BOTH characters. I bet Mashima just didn't think about it, haha.
Totally unimportant though, just thought I'd point it out for the hell of it.