Lil sis: Big sister the kids at school are mean
Big sis: aww well I love you!
Derrived from George Orwell's novel Nineteen Eighty-Four, where a character named "Big Brother" and his "Thought Police" are keeping track of everything and everyone.
Big sisters tend to be severe in punishment as well.
Any crazy old female teacher you had who appears to have eyes in the back of her head.