The parents could likely be partly to blame. Maybe they often left the boy with his grandmother and he disliked being there with someone so elderly.
Or the boy could have evil tendencies. One of my nephews, when very young, was like that. He’d be at a family get-together at a wealthy relative’s home, and mention to his cousins he was wondering what he should break. And he did break stuff. Now he’s a late teen, and into gang activities.
Maybe she just told him it was time to quit playing the game and take a bath....
(We'll never know.)