Etymon
pie-peh2-protoindoeuropean-ter-protoindoeuropean-ph2ter-protogermanic-fader-protowest-germanic-fader-old-english-fder-middle-english-fader-english-father-inherited-from-middle-english-fader
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.