If you are filing a joint return and they lived with her for the entire year, then yes, you can claim them as dependents on your return for the Child Tax Credit as long as they have social security numbers valid for employment.
If they do not have a SSN valid for employment, you can claim the $500 Non-Refundable Other Dependent Credit if they have an ITIN. You can apply for an ITIN with the return. You will need to print and mail your return along with the W-7 and any other required documents to
IRS
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
Claiming Non Citizen Spouse and Children on Your Taxes
How to obtain an ITIN
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