Mary Mary was consisted of sisters Erica and Trecina “Tina” Atkins-Campbell. The two grew up in Inglewood, CA, with seven siblings. The family was heavily immersed in the church with their evangelist choir director mother and their youth counselor father, both COGIC members. The sisters were close due to their desire to pursue music and their proximity in age. This prompted the two to enroll at El Camino College to study voice. As the sisters grew older, they began to pursue musical opportunities together, such as; joining church choirs and traveling gospel shows. The two even went so far as to enter the secular side of music, each back-up singing for various R&B acts.