When one only child, aged three, comes to stay with another only child, aged six or seven, misunderstandings are inevitable. Millie is delighted that little cousin Tucker will be at her house while his parents take a trip: he'll love to have her take care of him. But Tucker misses his parents, and inexperienced Millie comes on too strong--only to be rebuffed. Encouraged by exemplary parents, Millie does keep trying, even after Tucker dumps his pudding over her head. But true rapprochement begins only when she finally understands that he really does want his own shabby rabbit more than the new one she's been pushing on him. This neat balance of realistic and slapstick events (everybody falls into the bathtub) is well complemented by cheerful, cartoonlike illustrations that add to the humor.