My brother and I have a pretty good relationship, but he hardly every talks and is prone to anger and violence at home (he's never hurt me or anybody else, he just hits walls and stuff). We thought this would go away as he got older, but he's just got increasingly reserved and angry. He is nice most of the time, but it's just in some moments he gets really angry and doesn't talk to us for days on end. He is an intern now, and he's doing ok, which is strange because he did awful at school and college, which he failed miserably. He never had any friends at school or college and would spend most of his time alone. My mom said he would grow out of it, but he’s still the same now.

While I was looking for my phone, I went into his room (we sometimes play video games together so I thought it might be in there). I checked under the bed and picked up an envelope. I was stupid enough to open it of course, and I found really disgusting pictures, a lot depicting children of about 12 years old. They were not pornography or even sexually implicative, they were pictures of crime scenes and accidents and suicides he must have got from the internet.  He had circled some of the more gruesome and gory ones. I was appalled just looking at them, and just thinking my brother had printed these out for some reason just made me want to throw up.  He had also written pages and pages of something but I dare not look at what it was, probably something fucked up. 

I haven’t told anybody about this, I just found out earlier today, and I'm not sure what to do. My mother never takes anything seriously about him and his behaviour and my dad would disown him and kick him on to the streets. What should I do about this? Am I overreacting to the pictures?

EDIT: Forgot to mention he still wets the bed
user
Brother been acting strange all his life. Found some fucked up pictures underneath his
assistant
My brother and I have a pretty good relationship, but he hardly every talks and is prone to anger and violence at home (he's never hurt me or anybody else, he just hits walls and stuff). We thought this would go away as he got older, but he's just got increasingly reserved and angry. He is nice most of the time, but it's just in some moments he gets really angry and doesn't talk to us for days on end. He is an intern now, and he's doing ok, which is strange because he did awful at school and college, which he failed miserably. He never had any friends at school or college and would spend most of his time alone. My mom said he would grow out of it, but he’s still the same now.

While I was looking for my phone, I went into his room (we sometimes play video games together so I thought it might be in there). I checked under the bed and picked up an envelope. I was stupid enough to open it of course, and I found really disgusting pictures, a lot depicting children of about 12 years old. They were not pornography or even sexually implicative, they were pictures of crime scenes and accidents and suicides he must have got from the internet.  He had circled some of the more gruesome and gory ones. I was appalled just looking at them, and just thinking my brother had printed these out for some reason just made me want to throw up.  He had also written pages and pages of something but I dare not look at what it was, probably something fucked up. 

I haven’t told anybody about this, I just found out earlier today, and I'm not sure what to do. My mother never takes anything seriously about him and his behaviour and my dad would disown him and kick him on to the streets. What should I do about this? Am I overreacting to the pictures?

EDIT: Forgot to mention he still wets the bed
user
My brother is a disgusting pervert and I found some pictures of naked children
assistant