Ds has a physical disability, but is also autistic, though this has not been officially diagnosed.
This September he is starting secondary school and he is very anxious about it. This shows in bad behaviour (shouting, swearing) at times and also in being obsessed with his phone and certain interests.
I come from a different country and stay with my mum for a few weeks in the summer. It has always been clear that my mum doesn't really what to make of ds. There is not much interaction between them, not helped by neither being fluent in the other language.
When I was there this summer my mum didn't ask about ds's transfer or anything else to do with him. She did get annoyed with him a few times when his behaviour was challenging.
One time it was so bad that I took ds outside to talk to him.
My mum chose that moment to say to my dd's that ds needs telling off or he will become "socially unfit" in later life.
The dd's didn't know what to say - they are teens, but didn't want to openly contradict their grandmother.
When I came back in nothing else was said.
Aibu to have this playing on my mind and to be angry? In a way I want to say something, though chances are it wouldn't do any good.