My question involves child support in the State of: California

I am currently going through child support I hav claimed three children one of which is not his, she is from a previous relationship, but he was ok being her father and marrying me. We met when she was a few months born, but now we are divorcing but he does not want to give child support for the daughter that is not his, he was fine calling her his daugther until we started seperating, then he started saying shes nothing to him. Is is legal in the state of California for me to add her to my child support claim? She is now 9 years old, so she still believes she is his daughter we have not told her she is not, since he raised her all her life.