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”

  • belonging to or associated with a person of unspecified sex.
    “she heard someone blow their nose loudly”
  • 2. used in titles.
    “a double portrait of Their Majesties”

    Source credit: Google