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Calling Child Protective Services or the Fire Department is just a way of making someone else responsible for what the LW needs to do himself. If he thinks the child needs to be removed from that home, it is his responsibility, as the child's father, to do that. LW can try to make it clear to his wife that his intent isn't to end the marriage but to protect their son while she gets help — although she's not likely to believe that — but he doesn't have the right to sacrifice his son's mental health in the interests of saving his marriage.