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Your husband must abide by the court order that is in place. That means if his son comes to your home, if it's not your husband's parenting time, he would need to send his son back. If he does not, the mom can file contempt charges against him, which he would then have to go to Florida to deal with. More than likely, it would just be a civil contempt case.
The best way to go about dealing with this would be for your husband to file a petition to modify custody based on the facts you've stated. Judges care about the best interest of the child in question, and what you've described doesn't sound like the best situation for your step-son. Your husband could get legal custody of his son and then your step-son could live with you without fear of negative consequences for his father.