Mom came back from a business trip for nine months to pick her up, and when she stayed in a hotel with her parents, it was already after midnight to make out with them. Is it too much?

Not too much, but they shouldn't be with you and do that in front of you. They should sleep in different rooms. After all, you are a big boy, so pay attention. So are these parents. Isn't it good to open an extra room? After all, you are still a child! Have a bad influence.