That can't be legal, at all. I know when you have a lease, your notice is the same as how you pay. If it's weekly, you get a weeks notice, monthly, months notice, but in this case, I have no idea.

Do they even have a place to go? If they are up to it, I wait it out, take the 3 months and have time to re-group, find a new home etc.

I wish them and you the best.