Dear Bob, I believe that Mary Ellen Underwood d/o William and Mary, did marry the Dias.I have no proof. I am working on the Underwoods. They were very close to the Dias, actually lived beside each other, that is why I have no problem with Mary Ellen being married to the Dias. I think that it is likely., But like I said, no proof. Also, there does not seem to be any other Underwoods in the area. Hope this helps.