I agree, it depends on the parents and how much they care about how they look to other JWs. Many JW parents require their children to continue meeting attendence while living under their roof.
I've even heard of body of elders telling a brother that his adult daughter should move out since she no longer wanted to be a JW. The brother took a stand and said he was not going to see his daughter out on the streets. They couldn't do anything about but I'm sure other Jw's would've gave in to that pressure.
Yes, it is very conditional, even if the parents don't think it is.