Mamie Johnson had one sister, Lillie Belle Barber. Mamie was the Abbott family's trusted housekeeper for many years. She was an invaluable treasure to patriarch, John Abbott, Sr., and functioned as a surrogate mother to John's three oldest children: Jack, Ashley and Traci. John and his first wife Dina Mergeron divorced after she left John and the children, prior to their arrival in Genoa City. When Jack was eighteen, Dina sent him a letter asking him to join her in Paris. In 1996, both Dina Mergeron and Mamie sent flowers to remember John as they neither was able to attend his funeral.