To ask friends not to bring their sick child on Boxing Day?

[Genx77]

I need help rather urgently!
I have a boxing day gathering at our house every year for friends, everyone brings their children and we all have a great time.
However my friends son started with chicken pox on Monday, she tells me today she is still bringing him on Boxing Day. My son (3) has never had it. Will her child stil be contagious by Saturday?
I know my son will get it eventually but an added complication is that we are going on holiday in January and if he catches it we won't be able to go!
AIBU unreasonable or precious to ask her not to come? If not how the hell do I word it without sounding bloody awful?

Given the Mum's approach so far Merguez I wouldn't trust her not to bring him if there are still non-crusted spots that aren't visible. She is clearly prioritising her attendance over her son and the others at the party.

Yanbu
She's not being fair on you or her dc who may still be feeling poorly.

YANBU - just say no OP!!!

Tell her another guest is imunosupressed- less confrontational than Talking about your own child and she cant ask for detail about the other guest as it is personal information

another 'no' from me. I had chicken pox as a young adult and I was very unwell with it

YANBU. Tell your friend you are going on holiday and if your child catches it then plans will be ruined. Is she a decent, logical understanding type?
Its not right to bring a kid with chickenpox. Tell her sooner than later. And dont feel bad. Your family come first.

YANBU. I wouldn't take the risk at all if you are due to go on holiday. I would just explain your concern and your plans for a holiday and tell her on this occasion it's best if the poorly DC doesn't attend. Make your appologise for any inconvenience caused and end off. If she gets a bit pissed off, it's not your problem and IMO she would BU for that.

Personally I wouldn't take my poorly DD to a gathering. Everyone is different though.

YANBU

I'm somewhat in the "best to get it over with" camp but with a holiday coming up and possibility of other guests who have not had it in early pregnancy definitely not!

Chicken pox can kill. It's never best to get it out of the way.

The guest is wrong, the child is contagious and should not be outside mixing with others until they are not

It really IS that simple.

He's likely to be fine by Saturday.

People are being ridiculous about this.

There are "contagious" people all around us.

Five days after spots appear most children will have their spots scabbed over and be feeling fine.

YADNBU - a rather selfish person I know brought their CP child to a do she knew I was going to be at despite knowing I'm pregnant and immunocompromised
And was going to be there. I had to leave as I have no immunity to CP and it's highly dangerous for me to catch it. I was absolutely fuming as she didn't about her actions and then criticised me in front of everybody for not taking part!!!
I would spell it out to her as I think some people really do not think about these things and are very blasé about CP without understanding that it can be serious for others.

BathtimeFunkster when you say "contagious" people all around us. which diseases are you thinking of?

wonkylegs re I had to leave as I have no immunity to CP and it's highly dangerous for me to catch it. I was absolutely fuming as she didn't about her actions and then criticised me in front of everybody for not taking part!!! I think I would have been shouting very loudly about the reason I had to leave!!!

However, the nature of things is people do not always want to tell others if they are pregnant (some may even not know yet) and some may not want to tell why their immunity is suppressed. So really they are at the mercy of others to think sensibly. It's one thing to risk your own health, quite another to risk other peoples!

I didn't want to spoil it for the host as I think she would have felt (unreasonably) responsible but in other circumstances I would have been more vocal. Unfortunately the lady who brought her child has form for being rather selfish and doesn't seem to change no matter what people say.