Where does “bub” come from?

I can't write this etymology with confidence because the chain provided doesn't coherently connect to "bub" in English. The chain shows "brother" → "brother" → Yiddish באָבע (bobe, "grandmother") → Middle French through Latin suffixes, which doesn't trace a word meaning or path to "bub." To write an accurate one-sentence etymology, I would need: - A chain that actually leads to "bub" - Clarity on whether this traces to Yiddish "bube/bubba" (informal for brother/dad) or another source - Confirmed meanings at each step Could you verify the etymological chain for "bub"?

bub (English): An alcoholic malt liquor, especially beer; A...