Here are two census entries for dealing with the family

first courtesy of an Ancestry.Com transcription:
film T-6466 division 4 page 13 family 134 Sandwich E Twp
Michael R head 03-May 1864 Ontario
Marguerite A wife 25-Aug 1871 Ontario
William A son 04-Apr 1893 Ontario
Henry J son 18-Mar 1895 Ontario
Ernest J C son 04-Jul 1897 Ontario
Earl J E son 29-Jan 1901 Ontario

second courtesy the LDS 1881 Canadian Census transcription:
Sandwich, Essex, Ontario, Canada
Source: FHL Film 1375917 NAC C-13281 Dist 181 SubDist K Page 14 Family 72
James KELCHER M 25 Irish Ontario Occ: Laborer Religion: Roman Catholic
Gregorie LEDUC M 45 French Ontario Religion: Roman Catholic
Matilda ROBERT F 22 French Ontario Occ: School Teacher Religion: Roman Catholic
Mary ROBERT F 20 French Ontario Occ: Seamstress Religion: Roman Catholic
Albert ROBERT M 18 French Ontario Occ: Sailor Religion: Roman Catholic
Maxim ROBERT M 17 French Ontario Occ: Painter Religion: Roman Catholic
Emily ROBERT F 15 French Ontario Occ: Seamstress Religion: Roman Catholic
Caroline ROBERT F 13 French Ontario Religion: Roman Catholic
Anna ROBERT F 11 French Ontario Religion: Roman Catholic
Joseph ROBERT M 9 French Ontario Religion: Roman Catholic

I don't know how Maxime fits into the extensive network of Canadian Robert families so I would appreciate it if you would let me know if you find out.