If I were Obama’s grand-parents, I’d be happy to stay invisible if that’s going to help my grand-son get elected president.
You’d be surprised what people willingly do for their kin. For all we know, it might be the grand-parents’ idea to not go on stage. After all they raised him and contributed to who he is today.
You couldn’t raise a Black child in a white neighborhood by being in-your-face confrontational.