How did Dorothy Nicholas take part in the early Nicholas Kids act?

In the early stages of their career, Fayard Nicholas taught his younger siblings how to dance, sing, and perform by observing entertainers on stage. He initially formed a performance act with his sister, Dorothy, known as the Nicholas Kids. Dorothy participated in this act alongside Fayard before eventually opting out, at which point their brother Harold joined the duo, and the act became known as the Nicholas Brothers.1