That's only part of it. Let's throw in the mom there for a second too: "Oh she can have Josh's room." Yeah let's do that. Evict him out of his room for some stranger without so much as a please. That'll help mend their relationship. So yes, Josh is an idiot teenager, or otherwise known as, a teenager. It's up to him to not be stupid and start being part of the family, but the mom and dad can at least TRY not to make their relationship with him worse. Because they're being idiot parents.