Child Support fraud?!?!?

My step-sons have been living he with me and my husband for the past 1 1/2 years and the kids mother is still collecting child support, is this against the law? She would only let them move up here if she was still able to receive child support. should we bring this up to the judge? we are now in the process of changing custody, but i wanted to know is this fraud or contempt? we are in California.

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