very well then.
the first Robin was Dick Grayson, who was from the circus, but after the Joker killed his parents he became Bruce Wayne's ward and Robin. Eventually Dick quit and became Nightwing, and Jason Todd replaced him. Jason Todd was murdered by the Joker when he was trying to save his mother and was then replaced by Tim Drake. and recently Tim's parents put pressur on him to quit so he did, and he was replaced by the girl.
make sense?