Collins Chinese Dictionary Plus (3rd edition), 2011:
其
qí 代
(书)1
(=他的) his
- 他是演员(員),其父也是演员(員)。 Tā shì yǎnyuán,qí fù yěshì yǎnyuán. He's an actor, and his father is also an actor.
2
(=她的) her
3
(=它的) its
4
(=他们的、她们的、它们的) their
5
(=他) him
6
(=她) her
7
(=它) it
- 我们(們)应(應)尽(儘)量促其成功。 Wǒmen yīng jǐnliàng cù qí chénggōng. We must make sure that it is successful.
8
(=他们、她们、它们) them
9
(=那个) that