It's unfortunate that your parents still have acne, that's gotta be tough

But, everyone is different. A lot of people go through phases where they mysteriously break out, and then it vanishes just as quickly as it appeared. Although, acne is definitely very common in teens, and a lot of teens with acne do stop breaking out when they get into their adult years. Then, for other people, it's the opposite. To say no one grows out of acne, ever, simply isn't true. To say everyone WILL grow out of acne is also not true, because everyone's different