Siblings:
Joseph Alfred Slade 1830–1864
Elias Smith Dennis 1840–1917
Military
Mexican War US Army
Lieut 16th U S Inf
Sources
Binney, C. J. F. Binney, The History and Genealogy of The Prentice, or Prentiss Family in New England, Etc. from 1631 to 1883, Second Edition, private publication, Boston, 1883.
Find a Grave, database and images (https://www.findagrave.com/memorial/133991978/william_henry-darke-slade: accessed 12 November 2023), memorial page for William Henry Darke Slade (21 Apr 1820–5 Sep 1884), Find a Grave Memorial ID 133991978, citing Carlyle Cemetery, Carlyle, Clinton County, Illinois, USA; Maintained by Teresa Germann-Garside (contributor 47137093).
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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 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 William: