I, too, have not been able to find him in the 1851 Census, primarily because I do not know his parent's names. He was only 16 in 1851(b. in Toronto) so he probably was not lisited in the 1855 Census. I have not been able to find William Hogg's marriage record (to Mary Ann Heron) and no death certficate exists, and I have not yet found a church birth record, so I have hit a brickwall in finding out exactly where he was born in Toronto or who are his parents.
Thanks.
Jon