Speaks to his son in French, when I can't understand it. I think it's unfair to the rest of the family.
For example on Saturday we were in the car on a long journey and dh started speaking in French he does it often and I'm sure he's only talking about minor stuff but it's not nice because I don't know. I also don't see why he would want things to be said but me not to know.
His son doesn't speak French as his first language and is much better at English but can speak fluent French, so it's not even for understanding something.
Aibu to demand he stops this. Me and my dd and ds all feel the same.