I just caught something very interesting, if I do say so myself.
Remember Denise Robinson? CJ's first girlfriend in GTA SA, and the only girlfriend that is met without the player's consent. She and CJ meet in Burning Desire and from there on, she is CJ's only "official" girlfriend.
Now, I was just watching a leaked video on YouTube, and Lamar mentions that Franklin has an aunt...named Denise. They argue about Denise being a sex addict and whatnot, but the name just caught my attention. Maybe those claims of Franklin being Cesar and Kendl's son weren't total nonsense. But it could obviously be just a coincidence, I guess.