By the time Carly Benson was ready to give birth to her son, A.J. Quartermaine had remembered their night together. Carly and Jason Morgan agreed to have Jason pretend he was the father to prevent A.J. from gaining custody, according to Soap Central. The two were close and had a physical relationship so this was a believable story to those that knew them.
After the birth, Carly suffered from postpartum depression and left town, leaving Jason to care for the boy who he named Michael after his mentor, Michael “Sonny” Corinthos (Maurice Benard). Jason confided in his good friend Robin Scorpio (Kimberly McCullough) about Michael’s true paternity, and she thought that he should tell the truth. Later, Carly returned to town but was forced to leave again after shooting Tony Jones and being sent to a psychiatric facility. During this time Robin moved in with Jason, and the two cared for Michael together (via Soaps in Depth).
When Carly was released from Shadybrook, the three tried to cohabitate; however, the situation was untenable due to Carly and Robin’s animosity toward each other. Robin eventually moved out and made the decision to tell A.J. the truth about Michael.