It took me a lot longer than 8 months to realize the bad shape I was in after sustaining a complicated concussion.

Your brother probably doesn't even have the cognitive functioning to be self-aware enough to see that he is having trouble.

I think you and your family are the ones that have fully functioning brains and you need to exercise more patience and compassion with him; especially since you all still have the brains that work the same way that they have your whole lives.

I'm very sorry to hear that he has a short fuse - that's kind of par for the course and will hopefully get better over time. You can't expect someone to go through such a devastating trauma and for them to accept it quickly, especially considering the fact that their mental faculties are not working the way they used to. Shame on his therapist to give up on him. Maybe you should be looking for a different facility to help him instead of also considering giving up on him.

He's still figuring a LOT of stuff out and that can be overwhelming for a person with a fully functioning brain, just consider how hard it must be for your brother who's brain isn't working the way it has his entire life. It sounds like you expect his brain to work the way it used to - that he should be able to evaluate how quickly his temper flares up. You said yourself that his short term memory was greatly affected by this trauma! He might not even realize that he's getting inappropriately upset. And then "he acts" like nothing is wrong... well it's because his brain doesn't work as well as yours does - he's not "acting"!

If your parents can't care for him, then do look into finding him a home where he can receive the care he needs. I read a statistic that states a lot of homeless people are living in the streets because they are brain injury survivors and I don't doubt it at all. I was completely out of my gourd for a long time and if I hadn't had the caring people in my life to be able to put up with me and care for me as long as they did I am convinced I would be homeless now too because of sustaining a complicated concussion. But the people in my life were able to care for me back to how well I'm doing now. I wasn't able to work for over a year! But denial is a VERY COMMON side effect of a brain injury and I don't think it's all psychological having gone through it myself. I think a lot of it has to do with being unable to cognitively assess and analyze a situation.

Please remember, your brother isn't maliciously lying about the jobs he thinks he has, he's not acting and he's not trying to be difficult. They are just examples of how difficult recovery from
a brain injury can be. Blame society for not educating people well enough about brain injury, blame the medical field for not being able to help him more, blame the accident that caused him this trauma, blame anyone or anything other than your brother, because that blame isn't going to do him any good.