Theirs
Part of speech: pronoun
Definition: That which belongs to them; the possessive case of they, used without a following noun.
Their
Part of speech: pronoun
Definition: Belonging to them.Belonging to someone of unknown gender.
Difference between Theirs and Their
What is the difference between Theirs and Their?
Theirs as a pronoun is that which belongs to them; the possessive case of they, used without a following noun. while Their as a pronoun is belonging to them.
We hope you now know whether to use Theirs or Their in your sentence.