Darwin: “Or we dress me like Polly, her parents take me back with them, I join their family, and they raise me as their daughter. Twenty years later - "Congratulations, Penny's sister, you're gonna be a mother!"
Gumball: “...What?”
Darwin: “Then I move to the suburbs with Pompadour, my rainbow frog husband, and raise a couple of windmills and... Yeah! We need to find her!”