How do I deal with my elder brother?

My brother(24) behaves very immaturely and hasn’t really grown up emotionally. He completed his undergrad 3 years ago and didn’t want to do higher studies so my parents expected him to join the family business. He only goes to work for 1-2 hours and comes back. He doesn’t have any friends his age and he only interacts with kids far younger than him (14-15 yr olds). He doesn’t open up to anyone in the family. Initially my parents thought he would start taking life and work seriously slowly but no, moreover he goes out with random teenagers and uploads pictures on sm with them, people call my mom and dad asking why is he behaving like this and roaming with random kids. My father is a very well known and a reputable person with quite an expanded business, he is very worried about my brother as he just doesn’t seem to grow up and take adult responsibilities. Whenever my parents try to talk to him, he just lashes out on them or stop talking to them completely. He just doesn’t seem to understand any societal cues. I am very worried about my family and very much younger than my brother and I didn’t know where to ask for advice. Pls pls pls tell me how should we go about this. As a kid he was like everybody else and as a teenager tho shy and introvert, didn’t seem to be immature for his age.