My old school friend has done this several times, we go back years, without asking me, she invited her grown up daughter to a couple of our pre-arranged lunches. Once up in London, daughter was working near by, along she comes orders her lunch, waltzes off leaving her mother to pay for it. Another time a local lunch, sat down at a nice Cote restaurant, daughter in between jobs. Friend says,"X is shopping in the local town, but said she like to join us. Friend tells daughter, "I'd be delighted to see her" absolutely wasn't. Both times daughter gave us chapter and verse what was happening in her life, blah blah, friends she knew, what they were doing, colleagues, ex colleagues, don't know any of them, not particularly interested, she totally dominated the conversation, it was all about her, no chance of a quiet tete a tete with her mother, my friend. We arrange lunches specifically for a catch up. It massively pisses me off, I wouldn't dream of dragging my kids along, not that they would be available or want to if they were. I can't say anything because I know she'd be mightily offended.
So to answer your question, you most certainly are not being unreasonable.