I'm still on the hunt to figure out who the parents of William Conley were, but I think I may have found their potential origin. According to the "History of the County of Middlesex," the area was settled (around the time of William's birth) by British Loyalists who had fled the United States following the American Revolution. The time frame is correct, and I'm hoping it's true!
My only issue is that I do not know how to confirm this hypothesis. I'm not familiar with American historical records (hailing from Canada/England), but I would imagine that they are more extensive than the records from Upper Canada around this time period. If anyone with any knowledge of Loyalists (specifically from Vermont and New York) coming to the Middlesex, Ontario area during the late 1700s, early 1800s (specifically by the name Conley/Conly, or other variants), I would really appreciate any help or guidance you can offer!
If you have any questions about the information I know, please feel free to ask. Thank you in advance!