My wife is bilingual. Her mother has come to stay and whilst I was sat in the kitchen sending an email and my wife was folding some clothes up, my mother-in-law walked in and started talking to my wife in their native tongue, in which they continued to chat. They are both fluent in both languages and could have flipped between the two at will. There was nobody else present other than the three of us.
I felt excluded and not especially well treated. Am I being unreasonable to object? Or am I just being sensitive (or insensitive to them)?