"Maine Marriages, 1771-1907," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F46S-XXQ : 10 February 2018), Mr. Simon P. Bradbury and Mis Mary Ann Gowin, 10 Oct 1838; citing Shapleigh, York, Maine, reference 12238; FHL microfilm 12,238.
"Maine Vital Records, 1670-1921," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VZ36-CTW : 28 September 2017), Simon P Bradbury, 20 May 1901; citing Bangor, , Maine, United States, Division of Vital Statistics, State Board of Health, Augusta; FHL microfilm.
It may be possible to confirm family relationships with Simon 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 DNA with Simon: