502
Stillman was related to even greater wealth by marriage : his two daughters Sarah Elizabeth Stillman and Isabel Goodrich Stillman married the sons ( William Goodsell Rockefeller and Percy Avery Rockefeller respectively ) of business associate and friend and senior executive of  Standard Oil   William Rockefeller  .
 top members employees: Standard Oil, William Rockefeller
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 top members employees: Standard Oil, William Rockefeller