Justin and Jackie were married, and she was coming to surprise him and tell him she was pregnant. She caught him sleeping with another woman(the mom from poltergeist) I can't remember her name on the show I think it was Brandi. Anyway Jackie left Justin without telling him she was pregnant. She had Phillip at the same hospital where Elizabeth had a stillborn son, so Alan pretty much bought Phillip as a replacement. Elizabeth didn't find out til years later. Hope this helps.