In every case that i have tried, the question as to whether the jurors know any of the parties has always been asked. If it was, and the individuals failed to disclose this, there might be grounds for an appeal. If they did disclose their knowledge and the defense attorney failed to get rid of them with a preemptory challenge there might be an ineffective assistance of counsel argument that could be made, IF the attorney was on notice about the juriors knowledge of the defendant and the defendent had asked for them to be removed and the attorney failed to act accordingly.