The proposed relationship of Joshua BIRD as the father of John Thomazin BIRD and Elizabeth BIRD is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a distant cousin relationship between JA (a descendant of the John Thomazin BIRD ancestral line) and JAW (a descendant of the Elizabeth BIRD ancestral line) with a shared segment of 16.81 cM across 2 HIR segments.

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