In my journey through the Sowden clan I came across a Harry Sowden on a 1911 census Ontario Canada I do not know if it is the one that you are looking for but I'll give you what I found
Father Walter
Mother Sarah
Aunt Lely
Brother Fredrick age 14
Brother Thomas age 10
and Harry age 2
Ancestry .com family trees have three Harry Sowden
Harry Sowden 1907 Bradford Yorkshire England
Harry sowden 1909 Ontario Canada lived in Toronto
Harry Sowden 1906 New Jersey USA
hope it helps I'll relay anything else I find