According to my GF's divorce decree, she cannot claim her children on her taxes unless her gross annual income equals or exceeds $22,000. We plan to get married, will my income then come into play towards that figure?

(Divorce State = Texas / Now living in Arizona)

Also, if we stay unmarried, and she and the kids live with me for the entire year, and she stays unemployed, I know I can claim them, but how will it work for the children, if the bio father is claiming them?

Thank you for any assistance