maybe buy yourself this air rifle, let the boys use it..
maybe a cheap-o and a nice one..
.let them practice with the bb gun... if they do good then let em shoot the bigger one...
also, i aint sure if ya can shoot a center-fire where you are at, your house?, but those good air rifles should have the same handling sequence as a center-fire rifle.
those high power air rifles are just as capable for home defense. so dont think, or let the kids think this is a toy!!