1881 Canadian Census
The only Seymour Babcock listed was in Addington Co.

Household:

Name Marital Status Gender Ethnic Origin Age Birthplace Occupation Religion
Israel BABCOCK M Male German 44 Ontario Farmer C. Presbyterian
Nancy BABCOCK M Female Irish 47 Ireland C. Presbyterian
Levi BABCOCK Male German 18 Ontario Farmers Son C. Presbyterian
Seymour BABCOCK Male German 14 Ontario Farmers Son C. Presbyterian
Chester BABCOCK Male German 12 Ontario C. Presbyterian
Hellen J. BABCOCK Female German 10 Ontario C. Presbyterian
Eliza A. BABCOCK Female German 8 Ontario C. Presbyterian
Marietta BABCOCK Female German 6 Ontario C. Presbyterian
Margaret A. BABCOCK Female German 2 Ontario C. Presbyterian


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Source Information:
Census Place Hinchinbrooke, Addington, Ontario
Family History Library Film 1375872
NA Film Number C-13236
District 118
Sub-district H
Page Number 47
Household Number 192


I can't find any census record of Etta Martin with parents Irvin & Eva.

Good luck