Quenya 

-ntya

their

-ntya, possessive 3rd person pl. pronominal ending: "their" (VT49:17), corresponding to -ntë as the ending for "they". Besides -ntya the form -nta is also attested, but the latter clashes with the ending for dual allative. (Other variants of Quenya uses -lta for "their", corresponding to -ltë as the ending for "they".) According to VT49:17, the ending -ntya appears as -intya following a consonant (other sources point to -e- rather than -i- as the connecting vowel in such cases).