This is horrible! If abuse is suspected have father call CPS. I hope father's situation is not anywhere similar to mother's, or else it could backfire. If CPS finds abuse then your attorney can help father get full custody
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Perhaps father can file a motion seeking full custody and only supervised visits with mother. He can ask for a custody evaluation to be done by family court services. In my county there is a emergency screening procedure if the court feels there is abuse. You could consider making a report to CPS but they may expect dad to protect child in family court first. If there is an allegation of sexual abuse they might interview yr stepson at school. I worked for CPS for ten years. You can call me if u like.
This is not legal advice
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