The proposed relationship of Peter Williams as the father of Henry Williams Sr and James Williams is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a 2nd cousin, once removed relationship between SG (a descendant of the Henry Williams Sr ancestral line) and LBW (a descendant of the James Williams ancestral line) with a shared segment of 124.49 cM across 7 HIR segments.

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