Is Our's Correct?
Almost every noun in the English language can take the apostrophe 's to show possession. But this is not the case with pronouns.
You should never write "our's" with an apostrophe. It is not correct.
Why This Mistake?
With possessive pronouns, like 'ours' and 'theirs' ending in S already, it might seem natural to add the apostrophe. But remember that it's wrong.
Function 1: Possessive Pronoun
The first-person plural possessive pronoun in English language is 'ours'. It is used to refer to something or someone belonging or related to us.
Their house is like
'Ours' is a possessive pronoun replacing the phrase 'our house' to avoid repetition.
Function 2: Ours = Our Home
In informal British English, 'ours' can mean 'our home'.
Do you want to come to
of + possessive pronouns
Sometimes, to show belonging you can use the structure of 'of + possessive pronouns'.
He's a friend