I don't have my kids ssn, what do I do?

[Leonard]

You will have to have your kids SSN's in order to file your tax return claiming then as your dependents.  If you do not have their SSN's you can not claim them on your tax return

[StacyT]

You can file an extension if necessary: <a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/tax-tips/tax-extensions/filing-an-income-tax-extension/L5GIzgJaS">https:...>

Here are a few common reasons why you may need to push your deadline back:

More time needed to track down missing tax documents
Unexpected life event
Life’s been too busy