A word in the Declension of Nouns of the early 1930s glossed “baby” with short and long variants tet and tetta (PE21/19).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. tyetl “a tiny baby” under the early root ᴱ√TYETE “give suck” (QL/50), a word that also appeared in the Poetic and Mythological Words of Eldarissa with the gloss “babe” (PME/50). This became ᴱQ. tetta “baby” in Early Qenya Word-lists of the 1920s (PE16/135), and finally tet/tetta in the Declension of Nouns of the early 1930s as noted above. There are no signs of this word thereafter.
A noun for “brother” in The Etymologies of the 1930s derived from the root ᴹ√TOR of the same meaning, with a somewhat irregular plural torni (Ety/TOR). Its stem form is torn-, since with most inflected forms the Quenya syncope comes into play and the second o is lost.
Neo-Quenya: In notes from the late 1960s, Tolkien introduced a new word háno for “brother” (VT47/14). However, I think toron might be retained to mean a “metaphorical brother”, a close male associate who may or may not be related by blood, as with such words as melotorni “love-brother, ✱close male friend” or ᴹQ. otorno “sworn brother”. In this sense, háno would be limited to biological relationships, but toron would refer to brotherly (or brother-like) affection.