I am not sure if anyone is still following this topic, but I really hope so.
Elizabeth, I too am a descendant of Henry and Susanna, but through their son John. Any information from Henry back seems to be impossible. All I have about his past is that he was a farmer in Ireland who first settled in Pennsylvania, and that seems to come from a family bible on our side of the family somewhere.
We are starting to do some DNA testing to see if we can narrow down an area in Ireland to continue our search, or find other members of the family that may have more history than us.
William Gray is one of the sons of Henry and Susanna that seems to be lost upon our line. I would love to exchange anything about family history with you.