I say conjecture because in part of that article it says Ruth Calvert's father's name is Isaac & later it says his name is Isaiah. And nowhere does it give his parent's name or his wife's name. It seems that if so many references exist for him, that information would also be available. There is no death information & his birth year has a wild range of 60 years. If Ruth was born in 1730 then her father could not have been born in 1725. Just trying to find more about this mystery man & his family. Sometimes genealogy is really frustrating.
I might be able to assist but I need more specific information. You first discuss Isaiah. Then Isaac is added.
Dates, years and locations help. Also, this is in relationship to an article, but a pointer to the Article is not referred to in this set of comments. I will search the discussion list.
David Bell - Calvert Genealogy Research group - Facebook And the Surname project at familytreedna.com
thanks,
David