Birth date/full name from 1901 census.

It appears that Henry was staying at his aunt Mary Ann’s place in Toronto in the 1911 census.

There is a Henry “Leaver” (same mispelling as his parents) listed as a boarder in Toronto in the 1911 census, being born in June 1890, that may be him. His is not listed as living with his parents in the 1911 census. If this is him, he was living (with 3 other boarders: Edith Teeter, John McCauley and Mable Hughes) with George and Mary Ann Moorhouse, and their daughter Margaret.