Hi Mike. In looking at this again. I'm pretty sure the Thomas Lillis that is 35 in their home is the Thomas Lillis that is with Thomas F. O'Brien and Moris W. O'Brien in San Francisco in 1900.
I went by the Family History Library tonight and ordered the 1851 and 1861 Canadian Census microfiche for Peterborough. And the St. Josephs Records from 1825 to 1860. I'm thrilled to get started perusing those records. FUN! I hate to have to wait the 2 to 3 weeks to get the records.