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a child is not considered emancipated even at age 18, if they are still in high school. so the answer is no. additionally, if you and the Father are on the title to the house, he has a right to allow the boy to stay.
i understand how frustrating this is for you - but legal recourse is not available. unless when he graduates HS his Father is on the same page with you. then you can both tell him he must leave.