If your son is not able to appear on the day that the Court renders its Judgement, he should submit a petition to adjourn explaining the cause, for instance, sickness. Then the Court will fix another date to render its Judgement again.
Otherwise, the Judge will issuance an arrest warrant. In the event that your son does not appear again, then Court will not wait any longer and will render the Judgement in your son’s absence.
Even though the Judgement is in favor of your son, he would still be in breach of the law for not appearing in Court, for which there is a penalty.