What is the protocol about dead step grandparents?

Once again, I must beg the indulgence of the fluther community. My boy’s step grandmother recently died. I’m not sure how to approach the situation (bear with me, people, I’ve never dated someone with such an odd familial situation, and, thank you). When I asked him if he knew her and liked her, he said yes and then changed the subject. He seems happy but then will freak out about the littlest thing. I think this may be a side effect of the grief, but it could also be that he is stressed because his stepdad is grieving and his normal schedule has been thrown into chaos. I’m seeing him tomorrow and Saturday and i just want to know what I can do to comfort him and/or help him relax.