* Financial Dependence: If your 18-year-old is financially dependent on you (meaning you provide significant support), kicking them out might be considered abandonment, especially if they are still in high school and haven't had a reasonable chance to become self-sufficient. This could have legal ramifications, although proving such abandonment is complex.
* State Laws: Specific state laws might offer additional protections for young adults under certain circumstances. Some states have laws relating to the duty of care for minor children even if they've turned 18 but haven't completed their education. You should research your state's laws.
* Contractual Agreements: If you had a formal agreement with your child (written or verbal) about living arrangements, this could influence the legal aspects.
* Disability: If your child has a disability, there could be legal protections preventing eviction.
In short: While you likely *can* ask your 18-year-old to leave your home, it's crucial to consider the ethical and potential legal ramifications before doing so. It's highly recommended to seek legal counsel in your jurisdiction to understand your rights and responsibilities fully before taking such action. A lawyer specializing in family law can provide the most accurate and tailored advice based on your specific situation. Simply kicking someone out without consideration of the above could create serious problems.