Like the mother in the story, Florence Adams lives with her two boys named Sam and David in a Brooklyn brownstone, works in the city on a computer, is a ""good builder,"" and has constructed a ship for her sons in the back yard. This is about all the fun that Sam and David have with their full-time baby sitter Fanny until, sadly, Fanny decides to go back to Italy, and how the boys then get a new baby sitter whom they might love someday. . . but she can't make mushy eggs like Fanny did. The warm but not too mushy story will meet the demand for a non-sexist portrait of mom and a sympathetic view of a fatherless family -- but it's strictly short order, low salt fare.