When I first found Alexander there was mention of Margaret but no children given for her, only the Esther Avery data.
I knew that Dr. Theodore Writer, a nephew, wrote in an Orange County history that Aaron and Elizabeth had 14 children all of whom married and had children of thier own. Ultimately I found a listing of the three boys mentioned in my first post. Hope someone will come forward with the info.
It is most likely that the Elizabeth Writer who married John Van Tuyl was a sister of Aaron who married Elizabeth McKeeby. I have her born 5 Oct 1778 and died 6 Mar 1865. The dates differ slightly, but I know of no other Writer family in the area at that time.
I follow the Writer family as Aaron and Elizabeth are gggg grandparents. My paternal line goes back to Elizabeth's brother William McKeeby. My clan lived near Montague, Sussex Co. NJ and the Writers lived near Otisville, Orange Co. NY.