Their in a sentence

“I think,” said I, following as far as I could the methods of my companion, “that Dr. Mortimer is a successful, elderly medical man, well-esteemed since those who know him give him this mark of their appreciation.”
Arthur Conan Doyle, The Hound of Baskervilles

However little known the feelings or views of such a man may be on his first entering a neighbourhood, this truth is so well fixed in the minds of the surrounding families, that he is considered the rightful property of some one or other of their daughters.
Jane Austen, Pride and Prejudice

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Dictionary

Merriam-Webster
— of or relating to them or themselves especially as possessors, agents, or objects of an action
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Macmillan
— belonging to or relating to a particular group of people or things that have already been mentioned or when it is obvious which ones you are referring to
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Usage

63 uses of ‘their’ in The Hound of the Baskervilles, by Arthur Conan Doyle