Totally understand how upset you felt with his language, have read your 2nd response and I gather he’s just someone who is used to being in control, and not exactly one of those grandpas who joins in… except maybe the occasional comment if others are about to make it look like he’s “fun”. I gather this also from the fact you say he doesn’t really want to be go out with the grandkids but at the same time doesn’t want to be left behind.. so in actual fact he’s not there out of the joy of “being part” of young ones excitement… he’s there because of his FOMO ( fear of missing g out) my honest advice… I’d rather leave him in when I’m
with the grandkids and have fun with them, then have a row about him not being asked… than take him with me, walk on eggshells and have less fun… and provably still have a row. Some men are the kids who never grow up and can have silly interactions with their grandkids… whilst others are much more disciplined, perhaps it’s to do with their childhood.. but in the meantime YOU DO YOU… and leave him home… as my mum used to say to “hang as he grows”