 But before Amanda decides to give up, Marc steps up and tells them that Amanda knows about Fey being Amanda's mother.The Tanens tell Amanda that she was adopted because Fey didn't want to damage her career and felt that Amanda would have a better life with another family, plus the Tanens couldn't have children (Mr. Tanen has lethargic sperm).Having learned this, Amanda and Marc decide to look for the other piece of the puzzle...Amanda's father.