Your David7 ABBEY had a brother William7 (married Abigail Farnham). I have been trying to prove that William7 Abbey is the son of William6 ABBEY. The only link I can find is in Cleveland Abbe's book on the descendants of John Abbey, but the Colonial Dames 17th Century, a lineage society, will not accept his book due to lack of documentation.
How have you proven the David7 to William6 connection? It might help with my William7 to William 6.