Continuity mistake: When CC and Maxwell arrive at the wedding, CC has no scarf around her neck. When the scene cuts to her shortly after arriving there is a large brightly-coloured scarf around her neck, and two shots later it has disappeared again.
Continuity mistake: In the dining room, CC is wearing a scarf over her head as part of her "safari" outfit. When the shot shifts to a close-up of her looking horrified at the thought of taking the kids to the Zoo on her own, the scarf is suddenly around her neck.
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.