Hello , Good source when you can not get to 1850 census besides the courthouse Will and Estate records are the tax records that are year to year and dating back to the very early 1800's. When a son turn's 21 back in early 1800's he got to be on the tax list and is usually grouped near the father. I found it helpful in Vasbinder research. It also gives you the year the person entered the county. Be careful though. The townships change boundries frequently in 1800's. Kate Scott mentions in her history page 484 Peter as being a property owner with David Mason of a farm now owned by John Barr. On page 325 she mentions John Ostrander of Warsaw. He is 28 in 1850 census of Warsaw married to Ellen. Jane Ostrander age 77 lives with them in 1860. She claims birth in Ireland. In 1880 John says Mother is born in Ireland Father in New York. Good luck in New York. Have a good day ED