Looking for Graves of Michael Fletcher and Wife Helen Anna Fletcher IN East Whitby Ontario Canada

I have been unable to find the graves of Michael Fletcher, died 1909 in East Whitby, Ontario, Canada or his wife Helen Anna (Knapp) Fletcher, died 1929 East Whitby, Ontario, Canada. They had a son Edward Fletcher died 1929 Ontario, Canada. Son Zera Fletcher died 1884 East Whitby, Ontario, Canada. Son Frank Fletcher died 1910 Toronto, Ontario, Canada. I have not found burial site of any of them.