Is it true that was michael jackson part of the jackson 5 based on the following text?

The Jackson 5, or Jackson Five, currently known as The Jacksons, are an American family music group. Formed in 1964, the founding members were elder brothers Jackie, Tito and Jermaine. Younger brothers Marlon and Michael would join soon after. They participated in talent shows and performed in clubs on the Chitlin' Circuit. They entered the professional music scene in 1967, signing with Steeltown Records and releasing two singles with the Steeltown label. In 1969, the group left Steeltown Records and signed with Motown.
yes