It's Crazy in California
In the once Great State of California, when taking a youth shooting that is not your own child, you know, like your Grandson, you need to have on you written permission from the child's parent. Furthermore, if the shooting will involve a handgun, the written permission needs to clearly note that handgun shooting is approved.
Not giving advice here, but just passing along my observation and what I could garner from California Codes and other resources.
"Society’s abuse, misuse, or lack of use of its rights will not impinge upon my rights."