Billy Joel with his daughter, Della Rose, and his wife, Alexis Roderick Credit: Billy Joel/Instagram Key Points Billy Joel celebrated his 10-year-old daughter, Della Rose, graduating elementary school. The "Piano Man" singer said he and his wife, Alexis Roderick, are "beyond proud" of her achievement. "Amazing things are in store for this girl," Joel said of his middle child. Billy Joel is in a proud dad state of mind.