If your son is old enough he can opt out of the visit, though he may not because he has a younger sibling that would still have to go. I would talk to my ex and if that doesn't fix it I would have the courts readjust his visitation from whole weekends to possibly after school hours during the week.
I would also get my son to a counselor because the counselor will help you in your cause to straighten out your son's anger. If the counselor says that the visits are detrimental to your son's mental health, then you will have a stronger case.



