William Van Der Woodsen
William Van Der Woodsen is the father of Serena and Eric Van Der Woodsen. He is also the father of Charlie Rhodes, Serena and Eric's cousin... He is the first and fifth husband of Lily Van Der Woodsen. In season 2 Serena goes looking for her father, who left when she was four and finds him, treating her mother with a cancer treatment. Then William tries to win Lily back, but she is married to Rufus. In season 4 it is revealed that William is also the father of Lily's sisters child, Charlie Rhodes. In season 6, once Lily and Rufus are broken up, he wins back Lily with an evil plotted scheme.