I was kicked out of home. Not when I was 18, but I was still unprepared. My parents didn’t know how to handle me. I think I was probably depressed and I wasn’t doing much to find a job, having gotten discouraged. They kicked me out, and that confirmed my idea that I couldn’t rely on them—that they would never approve of me.
I think it was emblematic of things that had happened in our relationship since my birth.
After I was kicked out, my relationship with my parents was never very close again. Yeah, I survived and it forced me to make my own way in the world, but I don’t trust them, and I don’t expect anything from them and I don’t seek them out.
They haven’t changed the way they are, and as a result of that, mostly, and partly because of the past, they don’t get to see their grandchildren much. I have no desire to expose my children to my grandparents influence, especially since the kids have come home very demoralized after spending a week with them. They are mean to my kids, just as they were mean to me.
What you do now will have consequences long into the future. Will those consequences be like what happened in my family? I can’t say. Every family is unique. But I doubt if people consider the future in situations like this. I think they mostly are only concerned with the immediate situation.
Of course, this situation doesn’t come from nowhere. It was a long time in the making. It may no longer matter what you do now in terms of the effect on the future. There may be nothing you can do, positively or negatively to change the consequences of the past. Rome wasn’t built in a day, but once it was built, it was going to stick around that way for centuries, and nothing short of an incredible natural disaster could change that.
As to your immediate problem—I agree with @Julietxx3. Try to get what you want through kindness, not punishment. Let him know you love him and are behind him, even if he has to leave. If he does have to leave, maybe you would be willing to pay his rent, or a portion of it for a few months—a little less each month. Something to show him you aren’t just throwing him out with nothing.
The relationship between you and your son has been building for years. He probably doesn’t feel like you respect him, and when you tell him he has to follow the rules or else, he is not going to feel respected. What you need, I think, is to build a relationship of mutual respect. If you can get there, he and you can speak as adults and negotiate the rules of the household to something you can both live with.
This will be difficult to accomplish at this point in your relationship, but you start by talking, and by talking, I mean listening. You both should listen to each other, but you, as the adult, need to model that behavior by listening to him first. Try to find out what his concerns are and what he wants and why he wants it. Try to listen without judging. You’ll be dying inside, but it will help immensely in opening up communication. If he’s like me, he doesn’t think you really care about him.
Counseling can help if you can’t make it work on your own. Hell, it helps even if you are good at this. Well, it helps if you have a good counselor.
Otherwise, legal rights don’t really matter. If you want him out, you tell him he has to go. You call the police, if necessary. It’s definitely one way to solve the problem. I hope it’s not the way you end up using.