Answer:
most easily, first limit the amount of contact time with the abusive son of the employer. that includes face time, phone time and net time. Look for ways to arrange your schedule or duties so that you minimize your availability to him. Often, these abusive people want the feedback and negative banter so badly that he will need to get it elsewhere when you are just not "running into" each other as much anymore. also, realize that he sees something in you that makes you seem vulnerable to his attacks. Does he feel free to abuse because he believes you must tolerate it to keep your job?? This makes it too easy for him to continue. Ask God for wisdom in this matter because in His Word He promised to give it to anyone who asks.