The computer is 'theirs'. [=the computer belongs to them; it is their computer]
He bought his car on the same day his parents bought 'theirs'.
That dog 'of theirs' [=their dog] is always barking.
(..) We gotta get back. If they come looking for Daryl, we need to be there. You don't have to get back. Not yet. It's one of theirs, long range. We can listen in, keep track of them. So, if we're not going back, what are we doing, then? I think it's time we introduced you to Ezekiel. (..)2017 TvShow: The Walking Dead Title: Rock in the Road Season: 7 Episode 9