Tina Campbell and Erica Campbell are sisters. They are also a gospel duo named Mary Mary and have won three Grammy awards. As you may have noticed, neither of their names is Mary (for those with short memories, one is Tina and the other is Erica). We hope that the series, which shows the women's lives on and off the stage, delves into just why they call themselves Mary Mary despite neither being named Mary. It is just one of those things about which we are ridiculously curious. We kind of feel like it's false advertising. Bon Jovi has a guy named Jon Bon Jovi after all, and Van Halen has a dude named Eddie Van Halen.