I plan to tell my wife to sit down.
Why would you demand that she sit down?
We need to have a talk. I'm very disappointed in her behavior.
If you're going talk to her about behavior you don't like, you should at least ask, not demand, that she sit down. The conversation will get off to a much better start if you aren't sounding like an annoyed parent.
Yes, I guess you're right. I let my annoyance cloud my thinking.
I'm glad to hear you say that. You catch more flies with honey than vinegar.