Thanks all.
It was always suspected that Roy was the name but unsure.
Also suspected that he passed between census taking.
Both parents, who passed after Roy, are buried in Siloam Cemetery in London, Ontario as is another child, Ethel May McAdams 1878-1898. There is a large marker so space for additional names. Odd that Roy is not there as well. I will visit that cemetery and see if the marker exists for Roy. Perhaps lost or overgrown as so often happens. Attempts to find an address for an e-mail or letter to someone who holds the cemetery records have be unsuccessful.
All the best for 2023