Problem between friends

And sadly A has seen again that throwing a tantrum gets you your own way.

Indeed. But B had no choice really. He hadn’t done anything wrong but A’s reaction spoiled things for everyone else.
The trouble is, many of A’s extended family seem blind to his faults, don’t they?

O poor you! Horrible situation, but everyone is quite right, stay out of it, or their resolution could end up with them both turning on you.
And don’t be used as a “letterbox”, by that I mean, don’t repeat anything that either one says about the other to the other, whether you agree or not. Silence, in this case, is golden.
And if necessary, tell both that you’re not interested in their beef with each other, but you’d like to stay friends with both, if possible. Good luck!

I would say it's not your business and you want to keep out of it.
For what it's worth I think both families are at fault but B should not have been gossiping about the child in his own home. I'm not surprised he lashed out. Its what children do when they are hurt.
No one knows what goes on in families maybe the child has special needs? I don't think it is for anyone to judge really

Actually this is quite interesting. Before we knew we were talking about Mr Trump, the advice was mainly to stay out of it. Maybe that's what we should all do. Lots of countries have leaders we're not fond of. There are countries where citizens are in fear for their life for having different opinion, different religion etc . Trump won't be here forever. Maybe we should be more like the Queen.

Ah well now I've seen the update not sure the allegory quite works (although it's very clever) . In real life B was right to say what he did because that was his job. And A's child doesn't deserve the benefit of the doubt that I would give a real child.

keep well out of it, let them sort it out themselves

I always read a thread right through before commenting. I love the fact that others don’t - they read the OP and go straight to ‘add comment’! Sometimes missing a point or two ...
?

Are you actually the female in family B, Susie Woozie?
If not what has it to do with you.
Don’t get involved.

See what I mean?
Superb.
??

The OP is an allegory for the trump/Diplomat incident!

Right on cue Urm

Keep it zipped and let them sort it out. Both sets of parents could end up falling out with you if you get involved. Not your problem.

Argh!!!!

SirChenjin ?????

I think Mumsnet have an acronym for this situation don’t they?
RTFT

Please Miss what does the ‘f’ stand for ?

The usual

Flipping - what else?!

Was this supposed to be about Trump? Why?

Pronyrose - it was meant to be a joke although there was the serious underpinning point that Trump is a petulant naughty child

Amazing that people comment without reading the thread! I must say that at first I thought it was genuinely about "families" and wondered if you were the wife in the B couple, suzie. I am mightily impressed that Jane worked out the allegory (and embarrassed that I didn't).
However I would say in reply to EthelJ above that every other family that stays with the A's also says critical and derogatory things about the obnoxious child but he just doesn't get to hear them. And he's too stupid and pig-headed to listen to his "parents" when they warn him about this. ???

Meant to add that seeing this thread has made me wonder about another post on here about a 30-year friendship that's under threat ... it could so easily be about the same thing. I haven't actually read it through but must do so to find out as I don't want to upset the OP by assuming it is and making some flippant comment.

esmerelda . I don't know any real children as terrible as child A who has no excuse at all for his terrible behaviour

I think family B had already formed the opinion that they were not going to like child A under any circumstances which was actually rather childish behaviour because a) the two families had always close in the past b) it could cause a drifting apart of the two families which would put family B at the most disadvantage and c) that was a shame because half the people that child A met could get along with him.
Then child B starting gossiping in the background but his gossip reached the wrong ears and child A rightly didn't like what he heard so cut him off his party list. In reality, both children and their extended families need to get a grip because child A is going to be around for a long time.