The proposed relationship of Joseph Dougal as the father of
Elizabeth Dougal and
Sarah J. Dougal is supported by DNA evidence indicating shared ancestry within the family lines.
Specifically, DNA evidence confirms a distant cousin relationship between JWF (a descendant of the Elizabeth Dougal ancestral line) and OLR (a descendant of the Sarah J. Dougal ancestral line) with 42.61 cM of shared DNA across 2 HIR segments.
This match is consistent with their placement within these shared ancestral branches.