The proposed relationship of George Murray as the father of ET and GMT is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a distant cousin relationship between LC (a descendant of the ET ancestral line) and WK (a descendant of the GMT ancestral line) with a shared segment of 177.56 cM across 8 HIR segments.

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