Addressing the wrong problem
After reading all of the posts by you and others on this incident, I believe you are pondering the wrong question. Your gun and cwl are not the source or solution to this problem, your wife's family is the entire problem.
They can make up any story they wish and get you arrested at will. Each time will cost you lots of money and even more misery. Carrying your gun will keep you safe outside of your home and you should not stop carrying.
You need to finish the solution you have already started by living with your Brother. Don't get distracted by the return of your CWL, but focus on the real problem - getting distance from your wife's old family. Only you can decide what you are willing to live with, but do not expect that by not carrying, your problems will go away.
Stay vigilant in your meetings with step son and ex-husband.