Hudson Bay Company Chief Trader, then Chief Factor.
"Alexander of Ullapool, died 12 March 1802 (A.5/10 p. 195)
Children: Roderick, Benjamin, Patrick, Ferdinand (D.4/67 p. 44), Alexander (bapt. 13 April 1838), Samuel, James, Catharine, Mary (bapt. 19 April 1835), Margaret (bapt. with Mary), Jane (bapt. with Mary), Nancy." 
It may be possible to confirm family relationships with Roderick 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 DNA with Roderick: