Hmmm....wonder who REALLY called CPS??? Don't worry, Laughing - eventually your H will show his true colors to S. Meanwhile, make sure your D knows the truth, that you did NOT call CPS, and speak to your attorney immediately about all this.
Do you have an email you can contact S at? If so, write him a carefully worded letter, telling him you don't know who did this but that YOU had nothing to do with CPS, that you don't care about the child support but only about his well-being, that you love him and hope he is doing well in CA. Don't get into the fact that he's being told lies, or anything else. Just simple statements that you love him, hope he's doing well, and didn't contact CPS. Period.
