Cathal could certainly see how learned that would have turned Marcie's life upside down. His own parents had always been upfront about who they were to Cathal, at least about the parts they considered 'important'. Learning that your father wasn't your father must have been a shock. "I'm sorry your bio-dad is a arsehole," Cathal said. "I suppose you can be thankful that your ma chose to give you such a wonderful father to replace him. I'm such a believer that family isn't made from blood, but from love and choices."