The source of most of this data is Kittybrewster.com - Table 40. — This is not a primary source and you are invited to improve upon it.
"United States Social Security Death Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:V3Q6-PMD : 14 July 2020), Malcolm Arbuthnot, 21 Jun 2000; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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DNA Connections
It may be possible to confirm family relationships with Malcolm 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 Malcolm: