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It's a young adult book written at least 15 years ago. There's a teenager that gets a summer job as a babysitter/ mother's helper at the beach. One of the kids is a spoiled brat named Marcella. The teenager has a crush on a neighbor boy named Todd Crowley. Marcella calls him Turd Crawling and Toad Crawley and stuff like that. The girl remembers treasure hunts and fun things she did with her mom when she was little to entertain the kids.

I've been rereading all my old favorites lately and I can't remember this one! TIA