That relation is wife.
The source for the following is http://www.subudworldnews.com/index2.php
Simone Feldman
wrote book
maiden name Zimmerman
born 1931 Prussia
1945 fled Prussia to Gruenwald near Munich
died Sept 20, 2006 Honolulu
married to Reynold Feldman for 43 years (implies marriage in 1963)
married in 1963
named Subud helper shortly after marriage
"opened" by Michele von Roy-Lewinski in Munich, Nov 1961
helper in:
New Haven, Connecticut
New York City
Honolulu, Hawaii (where she co-founded the group in 1967)
Planegg (Munich) and Wiesbaden, Germany
Chicago
Minneapolis-St. Paul
and untill three months before her death, again in Honolulu
Simone Feldman's father appointed school principal in American zone in Germany
Simone Feldman's mother
Ruth Gertrud
also Subud member
lived with "us" (presumably Reynold Feldman, Simone, etc) for 19 years until death in 1990 (implies arrival in 1971)
From your link (http://www.subud-sica.org/index.php?hkat=7&ukat=24):
In September 1996 my late wife and I moved from Saint Paul back to our beloved Honolulu, where we had helped establish the Subud group in 1967.The tie is the founding of the Honolulu group in 1967.