Is there a limit on the number of dependents….?
For EIC, you don’t get additional benefit for more than 2 kids. For child tax credit and additional child tax credit, you claim however many you legally have as dependents who qualify. If she lives with you, and he claims her as a dependent, you can still claim her for EIC if you have earned income – he can’t claim her for EIC if she doesn’t live with him. But the child tax credit, and the additional child tax credit, go to the person claiming the child as a dependent. Since he is now married, he can’t file as head of household, but can file a joint return with his current wife whether she had income or not.