My wife's younger sister is a school teacher, and she has a teaching degree, but my wife has no qualifications at all. Nevertheless, she is no dumbo. Her mother once introduced the two sisters to friends thus: "This is my eldest daughter [indicating my wife], and this is the clever one [indicating the younger sister]." Even though my mother-in-law has long since passed away, my wife still says that she could never forgive her mother for that remark.