(b) Section 46.02 does not apply to a person who:
(3) is engaging in lawful hunting,fishing , or other sporting activity on the immediate premises where the activity is conducted, or is en route between the premises and the actor's residence, motor vehicle,or water craft, if the weapon is a type commonly used in the activity;
Therefore having your son over to shoot his handgun on your property
, In my opinion would constitute engaging in a sporting activity as would shooting ranges. I hope this helps 