Finding Descendants of Able, Jabez, and Jonathan of Poundridge

I believe finding our ancestry beyond John Clark of 1740 depends, in part, on learning more about his three brothers and a sister who each remained in the Poundridge area. Chuck has provided the names of the Clarks who were in the census records after our family migrated to Saratoga county circa 1793. It is a short list of names, and they are proving difficult to trace. Ziba Clark is a person of interest. He is in the census records, apparently in the same place, spanning four decades. So far, I have only uncovered two clues: Ziba had a granddaughter who moved to Connecticut, and his son, Alvah, recorded a deed in 1870. I plan to order a copy to see if this document can yield information about our family.