To make a possessive of an indefinite pronoun, add an apostrophe plus s, just as you would for a noun.

Examples: somebody's child

another's idea

Personal pronouns, including it, do not have any apostrophes for their possessives.

Incorrect: her's    their's    your's

Correct: his    hers    its    ours    yours    theirs    whose

If it helps, remember that his takes no apostrophe. In the same way, neither do any of the other forms.

The words it's and who's do exist, but they are contractions. It's means it is or it has; who's means who is or who has.

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