You were looking for information on Jacob Bartlett (Barlett)born in Montgomery County, New York. There is only a handfull of old records that list the Barlett name as Bartlett. Some of the later generations have added the "T" in Barlett.
Your Jacob Bartlett (Barlett) was the son of John Barlett and Marey/Mary Wood of Montgomery County, New York.
John Barlett married Marey/Mary Wood the daughter of Uriah Wood and Magdalena Quackenbush. Magdalena's will written in 1802 and probated September 1816 list her now living children, Marey the wife of John Barlet, Magdalena the wife of John H. Quackenbush, David (the second one), John and Abigail the wife of Nicholas Van Slyke.
David Wood married Sarah Quackenbush in 1787 and had 3 children. Sarah died in 1792 when their last born child Abigail was only 3 months old. David's sister Abigail adopted her. David then married Elizabeth Van Der Werken in 1793. John Wood married Margaret Van Der Werken, Elizabeth's sister. Abigail Wood-Van Slyke mentions her brother in law John Barlet in her Revolutionary Pension records.
John and Marey Wood-Barlett had the following children, Henry, Jacob, John Jr., Elizbeth the wife of Martin Dillenbach/Dillenbeck ( changed his sur name to Tillapaugh) and another unknown son and unknown daughter. They were all in Root and Glen of Montgomery County, New York before they headed to the following counties, Schoharie,Cattaraugus, Otsego, Herkimer, and Jefferson in New York state. David Wood just a year before his death moved to Earlville, LaSalle County, Illinois. His son Uriah moved to Whiteside county Illinois first and later moved to Earlville area.
Jacob's Barlett's daughter Maria Magdalena married George Dierich (Richard) Dillenbach and moved to Morrison,Whiteside County, Illinois. George was the son of Daniel Dillenbach and Catherine Spaker.Daniel was the brother to Martin Dillenbach/Tillapaugh. Jacob's son Henry moved the Jefferson County, New York.
John Barlett, Jr. and his wife Matilda Nicholas had a son Jacob I. Barlett that moved to Kent County, Michigan.