http://en.wikipedia.org/wiki/Casey_Affleck

Casey Affleck is an American actor. He has acted in films such as Good Will Hunting, Ocean's Eleven, The Assassination of Jesse James by the Coward Robert Ford, and Gone Baby Gone. He has been nominated for the Academy Award and Golden Globe awards. He is the younger brother of Ben Affleck.

Affleck is married to Summer Phoenix, the youngest sibling of the late River Phoenix, Rain Phoenix, Joaquin Phoenix, and Liberty Phoenix.