Born Henry St. Clair Wilson, the son of James Henry Wilson and Rebecca Mary Knight (1871-1899). After the death of his mother he was Adopted by her brother William Marlborough Knight and his wife Alberta Madden.
He married Marguerite Lina Richter on May 7, 1923 in Vancouver, British Columbia, Canada. They had two Children Robert Henry Knight and Patricia Caroleen Elsy Knight, both born in Los Angeles.