Hi Tim We are cousins (probably first cousins once or twice removed). I spoke to your uncle George on the phone about 10 years ago discussing the Kumm/Billian families. There are too many Agnes' in this family tree and it can get quite confusing:
Agnes Scoville m. Ferdinand Billian (my g. grandparents) they had a daughter Agnes May Billian who married Clarence Kumm they had as son Clarence George Kumm who married Agnes E. Hjart(Hart)
The oral history of the family (through Agnes Scoville Billian) is that she was "one-quarter Mohegan"-however, I don't know if she was Mohegan/Algonquin. Please take a look at my Billian website-there are quite a few photos too.
There is a photo of Agnes May Kumm and son Harold.