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David Gardiner Tyler ( July 12 1846 September 5 1927 ) was a U.S. Democratic Party politician and the son of  John Tyler  the tenth President of the  United States  .
 employee of: John Tyler, United States
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:
 employee of: John Tyler, United States