Fan services will give a button, like, pin "first time to Dodger stadium.
Doesn't hurt to ask Dodger Stadium customer relations about this.
I visited Dodger Stadium in June for the first time and they gave a badge saying it was my first Dodger game. I was visiting from Australia. Contact fan services I think and ask what they may do fir your grandson.
Not sure i never asked that , doesn't hurt to ask before coming to the dodger game.
Thanks! Your answer is awaiting moderation.