Yesterday I took DS to the park, and uploaded some pictures of him onto facebook. In the midst of comments my DH saw a comment from his step-dad saying something along the lines of "My beautiful grandson, whom i love very much". He never really says this, perhaps scared to overstep a boundary. However, MIL always encourages him to call himself grandad or when DS is over she says "go to grandad".
I've really got no opinion on it really, I've seen families where this happens and children have 4 grandparents and they're all very happy, including the biological grandparents. But, I noticed yesterday by DH reaction to the comment he wasn't happy and said something like "My mother really needs to stop telling Paul (not actual name) to say things like this". I could tell he was getting annoyed.
Part of me thinks he's in his right to think this, perhaps he's not comfortable with DS having another grandparent, when DH and his dad have a perfectly good relationship. The other part of me thinks maybe it's not a big deal, but I guess it's also dependent on DH's dad and how he feels in this situation.
I also don't think I should speak on the matter, as it's really none of my concern. I guess just looking for someone's perspective and maybe address with DH to avoid conflict, he's got a bit of a fiery personality, and would hate for there to be a falling out because everyone simply adores our DS.