A noun in the Gnomish Lexicon Slips of the 1910s glossed “family, etc.” of unclear derivation, though it may be related to G. eithog “ancestor, †father, sire” (PE13/113).
Gnomish
hilm
noun. posterity; one’s descendants, progeny, offspring
hilming
noun. inheritance, heritage
hilmir
noun. heir (m. or f.)
arn
noun. son
bo(n)
noun. son
eithlos
noun. family
gwaren
noun. family
gwarin(n)
noun. family
The word G. {gwaren >>} gwarin(n) “family” appeared in the Gnomish Lexicon of the 1910s, derived from primitive ᴱ✶ŋuarenđā (GL/44). It was a combination of G. gwa- “together” and G. renni “family” (GL/65), but it is not clear why the e became i in the compound.
Neo-Sindarin: For purposes of Neo-Sindarin I would adapt this word as ᴺS. gwaren as a combination of later prefix gwa- “together” and the Neo-Root ᴺ√RE(N)D “kin”. Furthermore, I would use it specifically for a nuclear family (just the parents and children), as opposed to S. nos(s) which seems to refer to an extended family or clan.
renni
noun. family
A noun in the Gnomish Lexicon of the 1910s glossed “a family”, derived from the early root ᴱ√redh- having to do with kin (GL/65).
A noun appearing as G. hilm “posterity; one’s descendants, progeny, offspring” in the Gnomish Lexicon of the 1910s, derived from the early root ᴱ√χili and cognate to ᴱQ. hilmie (GL/49). The Qenya cognate was apparently a variant of ᴱQ. hilmi “family, offspring” from the contemporaneous Qenya Lexicon (QL/40).
Neo-Sindarin: I would adapt this word as ᴺS. hilf in Neo-Sindarin, since [[s|non-initial [m] usually became [v]]], which was spelled f at the end of words.