here is a link to the 1861 census that lists Cyrus, John, Peter Bishop and Richard Atwell, but the census of that year only gives a numeric total of the family units (8, 10, 10 and 7); then this link gives the 1901 census links and then goes on and on with other Atwell references... at the bottom of the first page see 22 trees of info submitted by folks who use Family Search about Atwells and in-laws in Nova Scotia:
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DNA Connections
It may be possible to confirm family relationships with Cyrus by comparing test results with other carriers of his Y-chromosome or his mother's 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 Cyrus: