Sweet's first job for his brother is the most literal statement of what the Grove Street Families have lost: their own streets are covered in Ballas tags. Carl is handed a spray can and driven to Idlewood to paint over them, then out to East Los Santos to do the same on turf that is supposed to be theirs already.
One of the tags is watched, and the mission ends the way most early Grove Street work does — with a fight nobody planned and a drive home. It is the game teaching the spray can, which stays useful for the hundred tags scattered across the city long after this mission is done.