And again, going gluten free is FUCKING AWFUL. There are some quite good gluten free meals available nowadays, yes, but they are NEVER EVER as good as standard meals. Even just the basic things like gluten free noodles (made of brown rice) are never as nice as the real thing.
And gluten free bread is honestly disgusting, though I will admit some of the newer breads are not quite as disgusting as they used to be. I miss real bread SO SO MUCH. It's so bad that I just make myself ill by eating a white bread roll a couple of times a year. I would give up alcoholic drink (I rarely drink anyway) and every bar of chocolate or sweet treat in the world if I could just eat bread again.
Forcing people who are not gluten intolerant or coeliac to go gluten free is a horrible, rude imposition and it is absolutely entitled behaviour.
Nobody should never ever be forced to go gluten free who doesn't have to. It's in SO MUCH food, you have no idea till you try to avoid it.
I know because I am highly gluten intolerant, it started during Covid. I cannot be tested for coeliac because I have such a bad reaction to gluten (you have to eat gluten for weeks prior to the test, which is quite impossible for me) but they did the genetic test instead and it seems I am unlikely to be coeliac. However, whether it is damaging me or just making me sick is all one to me at the times when I accidentally ingest gluten.
Going gluten free has been one of the hardest things of my life (and yes I have hard lots of shit, hardship and have ongoing chronic health conditions, so no snark about well you mustn't have had anything hard happen to you will be tolerated at all). It's the day in, day out weight of it that gets to you. It took a couple of years for me to really remember to check absolutely everything I put in my mouth. At best, it's a daily nuisance, occasionally it is just miserable.
And yes, do not listen to anyone who tells you different, many gluten free prepared meals taste fucking awful.
There are more choices coming onto the market to be fair, and the biscuits and some of the cakes can be quite nice.
But yes, like it or lump it, a lot of prepared gluten free food is simply horrible and disgusting compared with the real deal.
And preparing everything gluten free massively limits other people's choices in their diet.
To demand another family eats gluten free so you can have a holiday in their home is the absolute height of entitlement.
I never expect a restaurant to be entirely gluten free and it's always a gamble eating anything prepared by others - so their decision on that is baffling and calls into question their other choices.
They all just have to exercise caution and the overbearing parents are the ones who must do most of the heavy lifting here.
I would never have chosen to be gluten free, it was forced upon me, it is limiting and a shit thing to have to deal with And it should NEVER be forced upon anyone who doesn't have to make that choice.
Nobody should have to miss a day of real food, let alone a week IN THEIR OWN HOME. I'd wish this shit only on my worst enemy.
So again, the parents must bring their own pots, pans and cooking utensils and toaster, and if they cannot or will not do that they can either buy their own and throw them away when they leave (as obviously you're not their storage container) or they can clean yours and use them like everyone else does and probably just avoid the toaster altogether.
There is NO NEED for a deep clean, unless he's wiping surfaces with his fingers and putting his hands in his mouth all the time. The 12 year old won't be preparing the food and by the sounds of it his parents will be in full Hazmat suits when they make him a snack.
A standard clean, wipe the shelves down and move the food into containers which are marked gluten, not forgetting the sauces, gluten hides in soy sauce and other sauces, and even today, after 6 years of this shit, I sometimes forget to check sauces outside my own home.
And any wastage or extra costs must of course be paid for by the parents of the coeliac child.