Hi, Mr. L'Amour published his Sackett family tree on pages 254-255 in his book "The Sackett Companion: a personal guide to the Sackett novels". It was published by Bantam in 1988. It's pretty easy to find at any good used bookstore. It may still be available at new bookstores also. It is a great book ifyou are interested in thefictional Sackett's.