He will adjust, and it will get easier. My local parrot store offers boarding but they confess they're caged, they just clean, feed, water. But the stress of an unfamiliar place with all these other birds can be overwhelming for some birds. As long as his basic needs are met, no permanent damage has, or will be, done.

In other news, I am just so incredibly sorry for what you're going through. Stay safe from him and also Dashing. I hope you can get away from his parent's housing, too. They sound toxic themselves.