Answer:
Sally, Lisa, and Bernadette are triplets. But Sally and Lisa share something that Bernandette does not. What is it?
Even if you throw it away, it still comes back.
Tall, I am young. Old, I am short. With life I glow. Anemoi is my foe.
What calls for help, when written in capital letters, is the same forwards, backwards and upside down?
What comes down but never back goes up?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.