If Isaac is decended from one of the four Bratton brothers who came over from County Antrim, Ireland in 1733 he may be related to another Isaac who is buried beside my great, great grandfather Abraham Bratton, born 1791 in Delaware or southeastern Penna. My guess is that Isaac is a brother to Abraham, both I believe sons of Thomas Bratton, born in the 1750s and son of Daniel Bratton, son of Samuel (one of the four brothers), all sons of Andrew Bratton born 1685/6 in Ireland.