Comes a time when you can't be a nice guy, no dad, mom AWOL & gramps teetering on the fence of reality Sounds to me like you have no recourse but to call the sheriff. I don't know how they acted towards you but if your situation is like the one I dealt with the kids are not going to listen to you anyway. Where did they get the guns? Grandpa? They obviously have not had proper instructions on respect nor safety.. If you think there's a chance of befriending these kids (your call) maybe that's what you need to do. It's tough in this day and age for kids whose parents are not there. Good luck, sounds like you will need it.
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Had not read your post, Bob, before posting mine, sounds like we're on the same channel. Maybe God brought those kids to you Little D, for a reason. Good advice, Montana.