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NeuroticByNature Kids who live at home, rent-free, aren't tenants. That doesn't necessarily mean that the police will help the parents kick them out, and the police may well tell mom and dad "It's a civil matter, a family matter, and unless you have an order of eviction we're not interested." It may even be possible that if an adult child is locked out of his legal residence the police, summoned to the scene, will tell mom and dad to let junior get his belongings, or perhaps even that they need to let him in and properly evict him. But once the deal is done, the odds are the police will tell the kid what they formerly would have told the parents, "It's a civil matter, a family matter, and unless you have a court order saying you have the right to move back in we're not interested."
Laws governing wrongful evictions under landlord-tenant law usually relate only to actual tenancies, so unless junior is actually paying rent the odds are he's not going to get very far by trying to sue his parents.
Besides...we only have his teenage side of the story.It's time for him to go out on his own