I am a descendent from this line (the brother Martin), or at least I may be. I have traced my line back to a Martin Mahaffey born in 1695. But the info is kind of unusual. It has him born in Maryland but dying in Donnegal, Ireland. His father appears to be a John Hugh (could be his brother, only 15 yrs apart) born 1670 in Delware and dying in Donnegal, Ireland. But I have info on what appears to be a father of one of the forementioned as Patrick John Hugh Mahaffey, born in 1625 in Armagh, Ireland.
Does any of this information sound or appear to be in line with yours? And if so, are there any discrepancies?