Morley does not appear with his siblings living with grandparents in 1921.
Sources
Nellis-Nelles Immigrants From the Palatinate 1710, Vol. 1, published in 1997 by The Nellis and Nelles Family Associations and the Herkimer County Historical Society #6994 page 612
"Ontario Births, 1869-1912," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV94-R65X : 2 March 2021), Morley Randall Bradt, 01 Aug 1905; citing Birth, Ancaster, Wentworth, Ontario, Canada, citing Archives of Ontario, Toronto; FHL microfilm 2,257,204.
Canada Census 1911: Wentworth Sub-Districts 1-15, Ontario, Canada
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DNA Connections
It may be possible to confirm family relationships with Morley by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Morley: