Personally, I don't think the atmosphere of the clubhouse or whether it's G/PG/R/X has any bearing on this. That is a personal decision for Adam and his family as to what he exposes his kid to. I don't know what exactly goes on in a MLB clubhouse, I've never been in one. I imagine there is some bad language, joking, naked men walking around after showers, maybe guys getting pissed off at each other etc... But that is a decision Adam needs to make for himself and his son. It certainly is not a matter for the MLB management to concern themselves with. It's not their job to raise Adam's child and it should not be their concern. I make no judgments on Adam for what he chooses to expose his son to. I think it would be REALLY cool to be able to hang out with a bunch of Major Leaguers if I were a kid.
I just think it is inappropriate to have a kid hanging out every day all day... Like it or not, adults act differently when kids are around. If they don't act differently, maybe there is always that thought in the back of their head that they SHOULD act differently. To have to be on your toes at all times with what you say and do, because there is a kid around, can become tiresome. If you are going about your business and say something and then think "Oh crap! Is Drake here?" every time you curse or make a crude joke kind of stifles the flow of things.
I work for a small business that my brother and I own. One of our employees watches a friends kid from time to time. There are things I don't talk about or do when the kid is around. And I don't do anything inappropriate at the office. I don't curse, don't make crude jokes, don't walk back to my locker from the shower naked or anything like that. But still, it is different when there is a kid in the office...
I would imagine it is tough for a group of adults to have to have this situation in the back of their mind EVERY day, ALL day at work. It doesn't sound like the WS are against having the kid around at all. I think it has become a courtesy gesture to the other players on the team. If there was an agreement in place, I can't imagine that they said it was OK to have the son around 100% of the time. If they did say that, they probably did not imagine either that Adam would do that or what the effect would be on the other members of the team. IMO, the WS are not wrong. And if Adam wants to make the decision to leave the team over it, that's his decision. I could retire on what he makes in one year. And he has been making it for a lot of years. I'm sure he'll be fine...