My reply was, "Oh really? That's nice. Since your New Mama is staying home to clean today, I guess you won't be coming to the party with me and Isabella. Have a fun day!" And I started getting my shoes on.
Immediately both boys were like, "No!! We were only kidding! You are our Mama still. It was just a joke! Hahahhaha. We were kidding Mama! Isn't that a silly joke?"