Gnomish
redhin
adjective. related
redhin gedweth’ ar gadwethu
*related of kinship and marriage
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A word appearing as G. redhin “related” in the Gnomish Lexicon of the 1910s, an adjectival form of the early root ᴱ√redh- that was the basis for kin words (GL/65).
Neo-Sindarin: I would retain this word as ᴺS. redhin based on the Neo-Root ᴺ√RE(N)D.