Fact: Burial Mormon Pioneer Cemetery , Omaha, Douglas County, Nebraska, USA
DNA
Paternal and Maternal relationships are both confident based on a triangulated group on MyHeritageDNA who share a 18 cM segment on chromosome 1, consisting of Barbara (Duncan) Fridlund and Lance Martin, her 4th cousin 2x removed, and Dennis Thornley, her 4th cousin 1x removed. (Lance and Dennis are 5th cousins 1x removed.) These matches have been independently verified by via the MyHeritage Chromosome Browser. Their most-recent common ancestors are John Duncan and Lydia Spiller, the 3x great grandparents of Barbara (Duncan) Fridlund and 5x great grandparents of Lance Martin and 4x great grandparents of Dennis Thornley.
Sources
William A. Duncan (1803-1847) on Find A Grave: Memorial #35005102 retrieved 18 November 2018
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DNA Connections
It may be possible to confirm family relationships with William 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 William: