Bingo. He will figure it out on his own. We dont need to point it out. What he does with his knowledge is up to him.
My daughter knows her in laws are controlling and doesnt like it but she is a "keep the peace" sort of person. They are her i laws, not ours, and we never see them anymore. But sometimes things my grandkids say is obviously from them.
My daughter has asked me to stay out of it. I do. Its her thing to handle or not. So we pretty much just mind our own business. This may not work for you, and it certainly isnt "fair" but life isnt fair to anyone. So we stay out of the small stuff. Raising our grandkids is not our job. It falls upon their parents to do what they feel is right, not us. What we feel is not fair is really not an issue. We raised our kids, mistakes and all, without our parents. They get the same chance. This is jmo