Not a parent, but the sign seems like a gentle reminder for the responsible party to make their accompanying children behave (I am an aunt). I am not at all offended by the sign as I also expect my charges to behave themselves when they are in my care (their Mom, my sister, expects it too). I am also taking into account the kind of store it appears to be (lots of small things, crowded space, things hung at lower elevations), so it all fits for me. My 6 year old nephew would be bored in such a store and I would not take my 2 year old niece into the place because she can have breakdowns.