French aïeul

← Old French aiol (inherited)

← Old French aiuel (mention)

← Latin avus (inherited)

→ English tresayle (derived)

→ Middle English aiel (cognate)

→ French oncle (mention)

→ French aïeule (mention)

→ French trisaïeul (affix)

→ French bisaïeul (affix)

→ Middle French oncle (mention)

→ Old French oncle (mention)

→ Ido avo (borrowed)