Joan was the mother of Billy Campbell. She lived in Palm Springs with her husband, William Campbell, Sr.. After her husband passed away, she and Celeste Campbell gave support to Billy in dealing with his death. She even went as far to sell the family's business before Billy could give up his dreams run it.
A few years later, Joan came to the wedding of Billy and Samantha Reilly. She had her feelings hurt when Samantha wouldn't wear a brooch that Billy's father had given her. She all but stated that she wished Billy had been marrying Alison Parker. She also got drunk at the reception and told Samantha that she wouldn't be the last love of Billy's life.