Can you throw an adult out of your home?

If they are not on a lease or a deed...Yes. If they are you need to process Protection Order paperwork with the local Magistrate. To do it well, give them a written agreement of when you expect them to move by with the explanation of what you will do with their property in the event that they have not taken steps to find somewhere else to live. If you are feeling benevolent, rent a storage space in their name and pay one month ahead and move the stuff there. Make sure they sign the agreement and give them a copy. Change your locks, if needed. For our son, we told him that if he did not have plans by May 20th, we would make some for him without his input. He made it happen.