Hi, My Brother Is 11 Years Old, I Do Not

hi, my brother is 11 years old, I do not know if it is necessary to circumcise his penis foreskin. He does not have any thing wrong with it. My parents heard their friends saying it was necessary to cut in order for him to grow. It's ridiculous to hear that kind of logic but I want to understand more about this so I can persuade my parents to do right.