I think I found Stella on the 1911 census for Canada and most of the children except for Clarence were born in the USA including an Albert who was born Apr 1898.
A John Albert Manning who was a Canadian serving in WWII was born in Lynn MA and listed his father as Manford Manning. This soldier was born Apr 18,1898.
Based on this information I found several children born in Lynn MA to a Manford R Manning and Stella M Powers. This couple were married 14 Feb 1895 in Boston. His parents were Abraham and Ellen, her parents John and Mary. The marriage was also registered in Lynn MA.