Misspelling of there.
"The teacher corrected the student's misspelling of their from there in the essay."
Belonging to, from, of, or relating to, them (plural).
"The children played happily in their backyard all afternoon."
Misspelling of they’re.
"The teacher corrected the student's mistake by pointing out that their was a misspelling of they're."
This word comes from Old Norse þeirra, which replaced the original Old English form heora. It originally meant "of them."