You can refuse but you can still be called. You can be what is termed a hostile witness by the prosecution and still be ordered by the judge to testify or be held in contempt.
Normally one is "served" with a subpoena. They have to hand deliver it and present it to you to know that you have been served. It would appear that at one time you were working with the prosecution and they expect you to continue. It would appear that now your not wanting to.
With all due respect why would you not want to continue through with this. It would appear that either you or your son brought the complaint against your husband. For the child's sake and future I would urge you to complete what you have started.
But to answer your question you can be found in contempt of court if you do not show after being served. It is your decision if you choose to testify or not. But as I said the Judge can order you to continue your testimony. Also, any testimony given already can or may be re-entered into the court record if this is a new trial. Let me know if this has answered your question.
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