Robert married Elizabeth Nickell. Robert and Elizabeth were first cousins.
Sources
"Illinois Soldier Burial Places, 1774-1974," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVYM-YCSQ : 10 September 2019), Robert Craig, ; citing Burial, , Edgar, Illinois, United States, Swango Cemetery, Illinois State Archives, Springfield; FHL microfilm 1,001,186.
Find a Grave, database and images (accessed 04 April 2021), memorial page for Robert Wiley Craig (19 Jan 1781–5 Jul 1848), Find A Grave: Memorial #20646888, citing Swango Cemetery, Edgar County, Illinois, USA ; Maintained by RCC (contributor 46891674) .
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DNA Connections
It may be possible to confirm family relationships with Robert 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 Robert:
There are two people named Robert Wiley in this profile both managed by the same person from 2011 and 2015. Apparently the request for a merge has occurred previously; perhaps the manager is no longer tending to this file.