The proposed relationship of Thomas Curtis as the father of Emily Curtis, Anna Curtis and LC is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a distant cousin relationship between JKH (a descendant of the Emily Curtis ancestral line) and ES (a descendant of the Anna Curtis ancestral line) with a shared segment of 53.89 cM across 3 HIR segments.

It also confirms a distant cousin relationship between WJ (a descendant of the LC ancestral line) and JKH (a descendant of the Emily Curtis ancestral line) with a shared segment of 32.45 cM across 2 HIR segments.

These matches are consistent with their placement within these shared ancestral branches.