Springing off the diving board with spirited if not Olympic form, churning the length of the pool, Susan Ford appears very much the daughter of her famous father, Vice-President Gerald Ford. Athletic and competitive like he is, she has held her own growing up with three older brothers. The mature 17-year-old Susan is also a good student at the Holton-Arms School in suburban Maryland where she will be a senior next fall. This spring she drove back and forth between school and home until Secret Service agents, wary of an incident or even the possibility of a "Patty Hearst" type kidnapping, began to accompany her around the clock. Since security in the backyard is easy to maintain, the Fords seem likely to spend much of the summer relaxing by the pool, which they built in 1961 at a cost of $7,500. The Vice-President takes a dip twice a day from March to November—an enthusiasm for the water Susan shares. She is, as well, an accomplished ballet student, amateur photographer and indoor gardener whose room contains 25 plants. She dotes on her Siamese cat, Chan, and enjoys rock music. "If she acts older than most kids her age," says a family friend, "it's because she's grown up surrounded by older people."