Yes. I mean, what is he going to do. Petition the court for contempt when he is ignoring a court order ?
Write him a letter and quote the section of the order. Let him know that if he is left unsupervised with the children then visitation will stop and you will haul his arse into court.
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Psst... I do not work for Macdonald’s or Burger King, and even if I did, I would not tell you. For sloppy bread, tired tomatoes, frozen onions, watered down mayonnaise and imitation meat, please find a drive through window with a person who openly admits they make that stuff.
My advice above is equal to the advice they would give if you asked that person a legal question.