Robert, it has been found through DNA testing via a male descendent (I don't have his info at my fingertips) of Myer Avery that his line is related to our family which comes off of Elisha Avery, the elder, who lived in Westchester Co. (Cross River/Pound Ridge, NY). He was born approx. 1710 and died approx 1808. You can google him and find a fair amount of stuff.
As far as I know even he hasn't been able to trace further back than Myer. The Myer Avery & Elisha Avery line connects some where further back in time than we can find. So we are all stuck at this point.I will clarify that DNA testing has verifed that we are NOT related to the Groton Avery Clan so don't believe any family trees that link Elisha Avery to that family.They assumed so prior to the DNA results.Good Hunting.