Donna tells her sister the reasons why she has decided not to tell Justin the truth. Justin reads something on the Internet and wonders if he is Marcus' father. Katie joins Bill for dinner and they end up making love. Marcus looks forward to being part of the Forrester family as Justin shows up to see Donna. When Donna shows up Justin wonders why she hasn't told him she has a son. Ridge is shocked when he learns that Eric is planning to adopt Marcus who hears Ridge talking about the decision. Justin tries to find out from Donna why she decided to give Marcus up for adoption. Justin asks Donna if he is Marcus' father.