I'm not sure if I can help or not. My 2nd great grandfather lived in both Jerico, Vermont and Ferrisburg, Vermont. Three of his sons moved to Ontario, but he left at least two sons, Philemon Birchard (born June 22, 1801), Martin Birchard (born March 8, 1802), and possibly Solomon Birchard (born January 8 1805) in Vermont. I only have the name of one son of Martin, which is Joseph. Philemon must have had children, but I do not have them listed. I even have a picture of Philemon and his wife! If you could find out where your William was born and a little more about him, maybe we can attach him to my line. If so, you could go way back! Have you checked the vital records for Vermont? Looking for sons of Philemon and/or Martin might be worthwhile.