If the kids do not live with you, you cannot claim them on your return. If there is a court order that he has the kids, then they would not be considered kidnapped. This would be about the only way you would be able to claim them as living with you when they do not.
If you have a tax liability for those years, you should file a return. You can print and mail your return without your dependents on it without an ID. You do not need an ID to file a tax return, you just need to know your social security number.
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