The George Dowdeswell, MD you refer to did actually have a son William, chr. 1761 at Gloucester St. Nicholas. You probably need to find William's death or burial date, and hopefully gain an age. Without sounding too miserable, don't believe family traditions without proof. I was led to believe that my own line descended from the same family (Unfortunately not). At this stage I don't have any more data on the William above, but feel free to e-mail me direct.