The Word is:”their”
their
/ðɛː/
determiner
possesive pronoun: their; possesive pronoun: Their; determiner: Their
1. belonging to or associated with the people or things previously mentioned or easily identified.
“parents keen to help their children”
“she heard someone blow their nose loudly”
2. used in titles.
“a double portrait of Their Majesties”
Source credit: Google