I don't think the mother can be solely blamed.
Nearly everyone knows stealing is wrong long before 13.
As for home training/discipline...my cousin and I were raised in nearly identical 2 parent homes. Good income, church, blah, blah, blah.
He's about 3 years older than I am. In his early teens...
If it's the thread I remember, wasn't this the poster's first pistol?
If the guy had a permit and no pistol already, carry it.
I probably would have. If for no other reason, to get the feel of carrying.