If you are still willing to look up information, I would love to have you check for a William Allen in NY (I belive Amsterdam). He was married to Catherine Hubbard and had 8 children around 1800 including Samuel H, John Thomas, and William. Most of them (I know John for sure) lived in Steuban County, New York but his children left the state, quite a few seemed to go to the Michigan area for some reason.
I have been largly unsucessful in finding William's parents/siblings. Any help would be wonderful!