Scared to Death — Jahnna N. Malcolm

Muffie, Elliot and Quentin Bullock are three rude, crude kids. They swear. They play horrible pranks. They burp. No one will ever baby-sit for them-not if they want to make it out alive. Then Mr. and Mrs. Bullock accidentally hire the meanest hag of a baby-sitter the kids have ever seen. She's almost as bad as they are. But the Bullock kids are going to scare her good, so their sitter never comes back. Only this time, they go a little too far...