Where my son is much younger then your kids, Keegan took his first got in TX under fair chase conditions at age 7 (under close watch of Dad of course). Using the same single shot 243 at the same ranch, he took his second hog at age 8. Needless to say even after killing a giant whitetail at home in Iowa with his muzzleloader.... Hogs hold a special place in his heart. Dad's love to brag so check out the pics!
Good luck to you on your hog hunt! We are leaving on the 21st to see if at age 9 he can score 3 years in a row.... one of these years he will let Dad start hunting them again! haha.