Sentence examples for their other from inspiring English sources

"their other" is grammatically correct and can be used in written English.
It is typically used to refer to someone's remaining or additional items or people, often in comparison to something previously mentioned. Example: "They had already chosen three books, but they couldn't decide on their other options." In this sentence, "their other options" refers to the books that were not yet chosen, in contrast to the three that were already chosen.