Solved
Do we still only claim our own children or do we both claim stepchildren as well now?
When you file as married filing jointly you file one tax return for both of you together. A dependent on your joint tax return is not claimed by one or the other of you. The two of you jointly claim your dependents. It doesn't matter which one of you is the biological parent and which one is the stepparent. You just list all the children on your joint tax return.
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