So you expect the business to take your word for it and then kick you out, after the kids have disturbed all the other customers or broken something? And I don't think it's realistic to expect children to behave like adults for an extended period of time. My mom took my sister to me to the Russian Tea Room when we were kids with a friend. We were like little old ladies. But that was only for about an hour. And not at night when we were tired. Had it been longer or later it probably would have been a different story.
And don't tell me "But my kids are different. They're super-duper-wuper." Because the vast majority of kids are kids and they have limits. And the bottom line is, some people just don't want to be around kids. Horrifying, I know, but it's true. Believe it or not, some of these people are parents themselves. And some businesses turn a profit by catering to that.