You have not provided any details regarding who else might be attempting to claim the children. But.....if there is someone else who claims them, and they file first, your e-file will be rejected. If that happens, then you will have to file by mail. You will not be able to e-file since the IRS will not accept two tax returns that claim the same Social Security numbers on them.
If you file by mail, the IRS will sort out who can rightfully claim the dependents.
As for who can claim them:
IRS interview to help determine who can be claimed:
https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent
https://ttlc.intuit.com/questions/3113432-who-can-i-claim-as-my-dependent
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**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
