If he is under this much pressure he should seek professional help thorough the mental health clinic immediately. They are trained to deal with situations such as this. The immediate resolution would be for your family member to seek resolution by going to the chain of command: squad leader, platoon sergeant, platoon leader, first sergeant, and commander. If he uses the chain of command someone will fix the problem if there is one. He can also go straight to the commander by using the open door policy.