Did they move out west? Do you have any pictures of them?
I also found this marriage for Frederick.
Fredrick Russell Huffman married Ellen Rosebud Shoultz, 30 Nov 1920 at Thessalon, Registration # 009959.
Fred was in WW1, living in Blind River.
There are other Huffmans in the Sault Ste Marie area that don't have anything to do with this family. A family of Huffmans drowned in a sailing accident at Manitoulin in the 1960s or 1970. They are a different bunch.