You likely have all this.
Sylvester Smith Hibbert,33,widow, married Margaret Barr in Clinton Tsp Huron County, 7 Feb 1894.
His mother's name is given as Nancy Ann Crowder. Nancy is a common nickname for Margaret.
He died in April 1894 of pneumonia under Hibbert.
1871 census Morris North Huron
Garret, 71, Ireland, farmer
Nancy, 60, Ireland
John, 23, Ont
Frank, 20, Ont
Mary, 16, Ont
Silvester, 12, Ont
1881 census Goderich Huron South
Nancy, 69, Ont, widow
Rosa Ellen, 11, Ont
Garrett must have died around Goderich area.
1881 census Ashfield, Huron North
Frances, 28, Ont
Annetta, 29 or 24, Ont
Marriages of child/ren of Garrett Hibbert & Nancy
John C Hibbert, 26, b Haldimand Tsp, living Goderich Tsp, married Margaret Kilty/Hilty, 19, d/o Robert and Rebecca Hilty, witn: Wm & Mary Hilty of Goderich Tsp, 17 April 1873.
Son of Sylvester Hibbert & Annie Cottle
Francis Edwin, 25,salesman, living Ft Frances, married Evelyn M Hill, 25, of Auburn Ont, both b Goderich Tsp, 20 Sept 1916 at Auburn Huron County.
CHeck cemeteries in Goderich area to see if Garrett and Nancy are buried there. I didn't find any death registration for either of them.
Try this site. It is an index of headstones.http://ocfa.islandnet.com//