system
A chat on subreddit /r/NoStupidQuestions
human
This might be a fun question over at r/amitheasshole.

I do not think it's unreasonable for your parents to be concerned. They hear their door randomly opening every day which is alarming. They don't know where their son is half the time which is alarming. 

I get *why* your brother probably does it though. He's living with his parents, so that can feel suffocating in a way. He probably wants to feel like more of an adult and do what he wants without permission. 

I think you guys need to have another family convo about it. Stress the danger and concern to him. 

Do you still live there? Maybe you guys can have a compromise where he just lets you know or texts when he's heading out.
gpt
Based on the general consensus here, this poor kid would be ripped apart over in AITA. A lot of people get unnecessarily ugly in there. Your advice is spot on and there’s no need for that if OP takes it!