User blog comment:Gumball2/The "Sister"/@comment-31563773-20170707134348/@comment-31563773-20170707141627

Well, in that case it's more of a lack of continuity. The series has it, but it's very selective. Most point that Brawl In the Family has a sequel in Room with a Fued, where the girls actually learn to try to change themselves than try to avoid each other.