Are you trying to make it hard or easy for your little sis to identify you? If you want to make it difficult, don't be so specific as to say what office you hold. Unless she's an idiot, she'll figure you out pretty quickly!
Anyway, my big sis completely lied about some clues then gave really vague clues, ie. I have blonde hair (she's a brunette!) and I love to eat at Taco Bell. I had no idea!! My grand-big sis wrote riddles for both of her little sisters. Hold me close and listen. (Her name sounds like shell) Tiptoe through the tulips. (Her last name was Holland.) My Aunt sis (wow it gets confusing) couldn't figure those out at all! Have fun with it...the clues don't have to be literal or true.