I was just with the Yasuzato's this last weekend at the Tokyo Budokan for the 19th World Karate Championships, where I was an official for the U.S. delegation. Yoriko is the daughter of the Yasuzato Sensei that you trained with. I trained with them in 1990 to 1992. Her husband took the family name, as their was no male successor for Yasuzato. They are both high-ranking and well thought of in the Japan Karate Federation. They have trained thousands of outstanding karate-ka in their own right and are well known for their children's program that has developed many national Jr. High, High School and Collegiate champions. They have 4 children. The oldest is with the Post Office in Sasebo, the 2nd son is with the Sasebo City Fire Dept., and the youngest son is with the Navy base fire Dept. They are always happy and excited to hear from former students of her father's. Perhaps the sai might make a nice gift back to the family?
Wishing you well.
Jay Farrell