I have namechanged for this. And the post is a bit long. But I would like to have some advice.
I live abroad with my DH, DD (10) and DS (8). Every summer we go back to my home country. We stay at DPs' house (they are great parents, very generous and welcoming). DBro+wife+3DCs and DSis+husband+2DCs live in the same village. DPs have a big house and a big garden, so all the children get to spend a lot of time at DPs house, playing together and having fun. This is all good.
Now the bad part.
Unfortunately, two years ago, DSis's son (8), my DN, was diagnosed with a mass in his brain. It seems that it is not a malignant tumor, but it's causing him seizures and he needs to have brain surgery in a few months. We are all worried about this, and I don't think I can imagine how my DSis and her husband feel.
DN has always been quite spoilt, from toddlerhood on. For ex., if the older cousins were playing some game, my DSis made them include him and modify their game because he was younger than them. Or, the other cousins were expected to share whatever toy they were using, but DN wasn't because he was younger. The main problem was that DSis+husband were getting too involved in the children's politics, and then blowing these issues up so that the adults would be involved, each defending their own children! So it ended up that my DBro's children are very friendly with my DC (possibly also because they see them only a couple of weeks a year), but they tend to exclude DN (although DB, my DM, and I do remind all the children to play together nicely etc etc).
Of course the adults are all treating DN "delicately" as we know that he's poorly. But the DCs do not know this (although they have witnessed a couple of seizures, but, except for that, DN looks like a very healthy and strong child), so all the cousins treat him "normally" (and then get told off by DSis for every little misdemeanour).
My problem is this: sometimes DN can be quite rude. For ex., he swears towards my DF, or makes comments on how slow/old he is. My DF has developed Alzheimer (which was hard for everybody to accept, and to see the changes in him, etc.) so, I am sure that if I hear anybody, even if it is poor DN, mis-treating DF I will not be able to keep my mouth shut, and I will tell him off.
AIBU?