The Feldmans — 9-year-old Rob Feldman, 5-year-old Brenda Feldman, and 3-year-old Rosie Feldman — are the cousins of Jamie Newton and Lucy Newton. They make their appearance in Kristy's Great Idea. Claudia is asked to baby-sit for the Newtons and finds that at the last minute, Mrs. Newton's sister needs a sitter as well for her three children (Rosie, Brenda & Rob).

The Feldman children are quite a handful. Rob hates all girls. Brenda was rather clingy to her mother and Rosie fought with Jamie. While Claudia is there, the Feldman children decide to start driving her crazy by running around the room screaming at the top of their lungs, jumping on the couch, and pretending to be ninjas. Claudia uses the ignore technique and rather than paying attention to the misbehaving children, starts reading books to Jamie. Eventually, the rest of the Feldman children stop causing trouble and become interested in the books Claudia is reading. They all settle down for a peaceful afternoon.

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