How do you acquire the grove street families in gta san andreas?

The brief Wikipedia summary states that the game follows Carl "CJ" Johnson as he returns home and works to rebuild his old street gang, the Grove Street Families, after discovering its decline. However, the summary does not detail the specific gameplay mechanics or steps required to acquire or reestablish the gang within the game. Consequently, based on the evidence supplied, we cannot provide a definitive answer to how the Grove Street Families are acquired in GTA San Andreas.