I would tell Grant that it honestly does not bother YOU, but as it bothers him, he should talk to his son. I am glad you are mature enough of a person to see past this childish behavior on your step-son;s part. Some day he'll realize you are important to m=him, it just hasn't happened yet. And as the "bad" stuff with his actual mother just happened tin the past year, he's likely still smarting from that, and has to work through his feeling about that before moving on.