This is for people who are still confused about the gangs.
I've been doing a little research on gangs in Los Santos, many people still argue about the grove street families in San Andreas are non-existent in gta 5 and "The Families" are completely different or this is completely different universe etc etc....
First of all let me mention that Ballas are based off the "Bloods" gang in real-life Los Angeles and The Families are based off the "Crips" gang in Los Angeles.
ok so, San Andreas timeline was around 1991-1992, "Grove Street Families" (which Carl was part of) was a set of the main gang "The Families" so the families aren't a new green gang, it isn't a different universe. There are many different sets of the families and the ballas and each set mentions the location. e.g. Lamar and Franklin are part of the "Chamberlain families" which is a set of the main gang "the families". so in gta san andreas the story was about a set, not the whole gang. The green gang still exists its just that they dont have control over grove street anymore. so for people who keep wondering what happened to the grove street families, well they probably got wiped out by the ballas, its been 20 years since then so now the set in grove street must be called "the grove street ballas". Cj's house isn't there cos they probably destroyed it along with some other houses. A lot of things can happen in 20 years.
So for the people who think its completely different or new, then no its not, its just different timeline. The Families still exist but their set the grove street families probably forced to move out by the ballas and most of them dying in the process.