Pension File: Civil War Service (Union Army): Zachariah Lewis. Held by the VA office. Names all children of Zachariah Lewis in full and their birth dates and places. Photocopy of entire file in possession of Shari S.
Autosomal DNA: Close Relationships / Triangulation. Descendants of Zachariah Lewis and Emeline Ramey on three different lines (one through son Gilbert, two through different children of Moses) not only share a substantial amount of DNA, but their shared segments are triangulated. (See A616565 and A610493 on GEDmatch; the third descendant tested at 23andMe and prefers anonymity.) These segments are in turn shared with descendants of descendants of Zachariah and Emeline's parents across GEDmatch/FTDNA/23andMe.
It may be possible to confirm family relationships with Gilbert 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 Gilbert: