Been the best thing that ever happened to us. Love the area, love the people. We've made many friends over the past couple years.
Your parents should be very happy.
ORSA is going to be the closet matches to Maryville. Less than an hour, more like 45 minutes. ORSA Web Site
USPSA, IDPA, Mulit-gun, Steel Challenge, plus other stuff. Well run place.
The only other place nearby that I've tried is TAC2 about 90 minutes NE of Knoxville. Small, more "casual"
Let me know if you have any specific questions about the area.