Not familiar with Canadian death records, but does William's not exist and give any details of his wife/s?
Is this his burial ref:
William LILLY, Beeton United, Simcoe, Tecumseth SM-TE-3621
and same ref for a
Robert LILLY, Beeton United, Simcoe, Tecumseth, SM-TE-3621
and
Mary Lilly, Beeton United, Simcoe, Tecumseth SM-TE-3621
Mary (Atkinson) Lilly, Beeton United, Simcoe, Tecumseth SM-TE-3621
plus a ref one digit difference and different cemetery
Mary Ann Lilly Alliston Union (Section F) Simcoe Tecumseth SM-T-3620
I see too that one of Elizabeth Ann Mitchell (nee Lilly)'s grandchildren (son's child) has the middle name Dixon (Dixon is often another version of Dickson). Did Elizabeth also note her mum as being a Dickson? And another grandchild (daughter's child) has McKean middle name!