Birth year assumes he was at least 18 when his daughter, Josephine, was born in her estimated birth year of 1848. Her birth year is based on her marriage record saying that she was 18 in 1866.
His last name may be similar to Roux. It has been difficult to find sources that agree on the spelling of Josephine's last name.
Sources
Name found on marriage record of Martin Spellman and Josephine Roux in Bradford, Vermont Town Clerk Records @ familysearch.org
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DNA Connections
It may be possible to confirm family relationships with Frederick 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 Frederick: