The proposed relationship of Thelma Mae Wardell as the mother of Robert Charles Ferkel and Hubert Jr "Herb" Ferkel is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a great aunt / uncle relationship between KLF (a descendant of the Robert Charles Ferkel ancestral line) and GAF (a descendant of the Hubert Jr "Herb" Ferkel ancestral line) with a shared segment of 935.97 cM across 26 HIR segments.

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