There is no indication that George or Harriet is buried in the Hampstead cemetery, however their names are on their daughters stone:
"Erected by George & Harriet Wingham in memory of their daughter Sarah Jane who died Feb 7, 1860 aged 2 years 3 months"
Harriet Wingham died Dec 6, 1884 in Waterloo age 50 years 24 days. The informant was George Wingham of Waterloo Township. registration 018607
Elizabeth Martin Wingham died Oct 26, 1930 in Hanover, Ontario. She was born March 23, 1845. Her parents were Isaac Martin and Magdalena H??h Elizabeth is buried in the Doon cemetery. The informant was Sarah L. Jaemison (daughter) registration 017790