I have a personal headcanon in general, but also in CRCB, that none of the guys are anywhere close to wanting children, if they ever do.
But they are all on board (to varying degrees) with being the fun uncle.
John would take the kid fishing or camping but would be mildly cranky by the time it's over because he can't smoke cigars or cigarettes around a child and he underestimated how tiring it would be to supervise a kid. Johnny and Kyle would load it up on sugar and they (Johnny) would teach the child bad words before they give it back to its parents. They treat it like a Tamagatchi with the added stress of not letting it shove things in outlets or walk into sharp corners. Ghost would probably scare the shit out of a child initially, but once they're acquainted he'd be a little awkward. Doesn't know what kids shows exist really, doesn't particularly want to subject himself to Bluey or Spongebob.
"Do you... want to watch Top Gun or something? And when are your parents coming back to get you?"
Oh they all give such uncle vibes lol. Especially Johnny. He's the fun uncle that gets the kids all riled up and in trouble lol. He's playing soccer with them in the backyard and not letting them win lmao. He so teaches them bad words too just because. Kid's going home saying "fuck" for sure.
Kyle I think would be the best with kids and keeps them entertained and well behaved. Might get them riled up for a bit if only to tire them out later. Will suffer through Spongebob if only to keep them entertained.
John so would take them out to do something, get some fresh air and spend some time outside away from screens. He's probably good with kids but doesn't realize it or believe it. Definitely needs a cigar after they leave though
Ghost definitely puts them in front of a screen to entertain themselves. Might be convinced to play video games and then gets frustrated when he can't figure it out lmao. Does eventually figure it out and beats them once and immediately feels bad and lets them win every time after. Would show them a movie they're not nearly old enough to be watching. Let's them get away with things because he does not know how to parent and will not know how to say no without it being mean.