What not to say to a pregnant, exhausted Mom at the end of a day of wrangling two young children

Son: “Mom, what planet has a hurricane on it?”
Mom: (Oh shit.) “Um, Saturn?”
Son: “No mom (duh), Jupiter.”
Mom: “Who taught you that son?”
Son: “Daddy.”
Mom: “Good thing you have such a smart Daddy.”
Son: “Mommy, why aren’t you smart?”
Mom: […]

Update: Hold the presses, Saturn does have hurricanes. Mommy really is smart!