The Nuchslep - S1-E4
Continuity mistake: When the Chinese food is delivered, Fran's hair is very flat and the curls are loose. In the next scene, she goes to talk to Maxwell and her hair is noticeably curlier.
The Nuchslep - S1-E4
Other mistake: About 2/3 into the show, Fran carries a box of cookies into Maggie's bedroom. The box's name brand is covered over but Fran says she brought the Mallowmars. However when they show an actual cookie they are eating, you can see it's a Snackwell Devil's Food Cake cookie, not a Mallowmar.
Answer: Mr. Sheffield needed someone to manage the kids, not necessarily babysit them. Brighton was a Bart Simpson type, Maggie was shy and awkward and Gracie had personality issues.