The best thing for you to do, is to leave your daughters on your tax return and file it by mail. The IRS will then send letters late in the year to you and to anyone else who has listed them on their tax return requesting support for the claim that they are the dependents of the filer.
The IRS will process the return that you have filed as you have filed it.
The IRS will then adjust the incorrect tax return and that taxpayer will be responsible for paying back any refunds that should not have been paid, plus penalties and interest. If certain credits are claimed on the return, such as the Earned Income Credit, the taxpayer can be barred from claiming this credit for up to ten years.
They IRS will not give you any information about the other person's tax return, but if the girls are your dependents your return will not be altered.
@Staciej32
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