1851 census Blenheim Oxford County Ontario
SCHREMMERHORN
Laurence, b USA, widow, 60
Rachel, 22, Canada West
Nancy, 18, CW
John, 16, CW
Nicholas, 14, CW
Walter, 9, CW
Melinda, 6, CW
Walter and Melinda belong to Jane?
Don't see Laurence on 1861 census. There is only one Schermerhorn family in Oxford on that census and it isn't any of the above names.
See on Ancestry.ca several marriages of children of John Wesley Fritch.
William Allen Fritch b 5 Feb 1838 died 10 Feb 1922, father given as George Fritch, mother unknown.