At two ranges that I go to, they have the same general rules. I take my Grandsons with no problems. It's understood that I am the required responsible adult. For that period of time, I am considered his guardian. I also take them hunting to meet that requirement as well. As Vanya stated; ask the folks but remember that most of the time when you ask, you probably won't like the answer because they are then forced to fall back on their CYA program.
Be Safe !!!