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Dear Ms. Moran,
Thank you for contacting History Hub!
We suggest you contact the Washington County, NY Historian. Their website is http://www.co.washington.ny.us/277/Historian and their phone number is 518-746-2178. The office is staffed with people who are knowledgeable in local genealogy and history. They have numerous sources including genealogies and family histories, family bibles, letters, and newspapers for Washington County, NY that may help you find the names of Thomas Bishop’s parents.
We also suggest you check out the Washington County Historical Society. Their website is http://www.wchs-ny.org/. They also have a library containing primary sources for the area and are equipped with handling genealogy questions local to the area.
Best of luck in your research!