Awesome big sister

Ask my daughter if I can leave the baby (nine months now) playing in her room while I get dressed.

Daughter: "Of course"
Me: "You are an awesome big sister"
Daughter: "Why do you keep saying that?"
Me: "What, that you are an awesome big sister?"
Daughter: "Yes, I already know that"
Me: "So, don't tell you that anymore?"
Daughter: "Right"

She is an awesome big sister BTW.