The proposed relationship of Howard Chessman Titcomb as the father of Gilbert Merrill Titcomb and Dorothy Stevens Titcomb is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a great aunt / uncle relationship between LK (a descendant of the Gilbert Merrill Titcomb ancestral line) and KLJ (a descendant of the Dorothy Stevens Titcomb ancestral line) with a shared segment of 881.87 cM across 25 HIR segments.

This match is consistent with their placement within these shared ancestral branches.