Filing of a divorce suit in the Washoe County court at Reno yes terday signaled a rift between a wealthy, socialive Hillsborough couple who have been married for 10 years. 2 Complainant in the divorce suit is Mrs. Nancy Morse Hooker, the wife of R. Lent Hooker of 45 Aster road, Hillsborough, the son and one of the heirs of the late Robert G. Hooker, wealthy San Francisco realtor and third mayor of Hills borough in 1926, Mrs. Hooker is the daughter of S. F. B. Morse of Pebble Beach and Mrs. George Richardson of Lake Forest, Ill, swank Chicago suburb. The pair were married 10 years ago and have two children. Rumors of a marital rift be tween Hooker and his wife have been current for some time and were confirmed by Mrs. Hooker's suit yesterday.