Byline: Pamela H. Sacks All his life, William S. Patten saved family correspondence. He stored the letters away in boxes while at an English boarding school and then as a student at Groton and Harvard. Later, when Patten was told he really ought to write a book about his life amid upper-crust society here and abroad, he had plenty of original material. He used the hoarded letters to form the backbone of "My Three Fathers: And the Elegant Deceptions of My Mother, Susan Mary Alsop."