Are you talking about the world your games take place in or The Man From The Window?
I suppose that this game takes place after "The Bit More Know 2" and Mama Rabbit is the newest employee to work at Bartleby's Bakery and she must've taken up the job as it was the only job she could get and she makes just enough money off it for her and Junior to live off.
I'm guessing the Man might return in a future game where he either torments a new family or at least makes an appearance as a cameo. By the way why don't the Rabbit's have tails? regardless I have no problem with it and it's just something I'm curious about.