>> go see that gun and show me what you can do. >> reporter: he calls it behavioral skills training. that's what these kids are getting. >> i want you guys to go in the kitchen and do your homework. >> reporter: he's having them act out exactly what to do if they were to spot a gun in lots of different situations. >> oh, my goodness, there's a gun in the kitchen? >> reporter: now we're going to test two sets of siblings from the class, katd den and nolan and harrison and julian. they all seemed to be paying close attention during the gun safety class. harrison and julian's mom says they have very different personalities. >> julian is the funny kid, always laughing. very curious. at times he'll test the limits. harrison is more of a rule follower. >> reporter: our other set of siblings have different