If you are over 18 years old your parents are no longer your guardian and cannot hold you against your will. If you are being held against your will, call the police or your local family services. If your parents have been legally appointed your guardian by the court, they can hold you against your will if it in your best interest to do so. Many times, parents have to obtain legal guardianship over their adult children so they can do what is best for them, but no one can get a guardianship...
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Missouri does not recognize common law marriage or "palimony" and I am sorry to tell you that with regards to the ownership of the house, you are out of luck. If the house was deeded to him, its his house and you were a guest. You have no claim even if you were helping to pay the mortgage for three years.
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