The Catherine "Katie" Powers in your family tree married to a Robert Francis white was my 1st cousin (3x removed). The Power side of my family comes from Salmon Cove (now Avondale) Newfoundland. My great great grandfather was John Power. The 's' on Power was added to the Power surname in the US only. In Canada, Newfoundland and Ireland it is Power. I really don't know why the 's' was added.