Isaac was born before 1853. He was the son of Alfred Dowden. He passed away about 1900.
Sources
United States Federal Census, 1860, Natchitoches Parish, Louisiana.
Find a Grave, database and images (https://www.findagrave.com/memorial/22352481/isaac-jacob-dowden : accessed 05 June 2022), memorial page for Isaac Jacob “Ike” Dowden (1851–4 Jan 1946), Find A Grave: Memorial #22352481, citing Old Kisatchie Cemetery, Natchitoches Parish, Louisiana, USA ; Maintained by SFC USA RET Duffie and Kathy (contributor 46950425) .
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DNA Connections
It may be possible to confirm family relationships with Isaac 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 Isaac: