Except in Texas the use of deadly force in defense of property is pretty much a no-go. (And Texas only allows it in the nighttime.)
Having passed that hurdl;e with relative ease, we get to
His license was revoked when he spent a year in jail on charges of vehicle theft, possessing drugs and assaulting a police officer. He was just released in January, and was applying for jobs. Before that, he'd been convicted four times for taking a vehicle without permission.
Kaluza admits her grandson made a few mistakes the last few years,
"A few" mistakres? I count seven - five of which were practice runs for this attempt.
Not a violent person? Gawd help me then, because I'd hate to see what she considers "violent".
He can call and say "I love you, grandma" all he wants, and rake her pine needles till the cows decide to leave home again. That does not make him a productive member of society. For all
intesive porpoises he is a career criminal. I do not approve of how his career was ended, but it seems from many years of contact with that population that the majority of them wind up doing life on the installment plan or suddenly being made redundant with extreme prejudice.
If both sets of grandparents were active in raising him because he was born to 16-year old parents, there just might be a clue that neither set of grandparents has a good grasp on that whole parenting thing. (Yes, I know all too well that in spite of doing everything you can to turn them out as productive members of society they can end up fouled up - the Former Daughter is my own shining example of utter failure in spite of everything.)
No matter how this plays out for the shooter it is not going to be what you might call a positive and enjoyable experience.
stay safe.