Thanks to Jane for giving my foggy brain a clear suggestion. I checked the Peel OGS site and came across the index to the Upper Canada Land Book and low and behold William Chevin and John Smith are neigbours. John's son Richard marries Mary Ann Cheavins and it looks like William is her father. William is residing with a younger William (his son?) in the 1851 census. Now to order the land record CD and see what other info I can find. Jim