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Brian MacMahon was born in Sheffield, where his father, Desmond MacMahon, was a professional violinist. In 1948, he married Heidi Marie Graber from Switzerland died 2001; the couple had two sons and two daughters. MacMahon also had a brother, Paddy, who was a doctor in the British Army. MacMahon emigrated to the United States in the late 1950s, and became a U.S. citizen in 1962. He died at Boston , Massachusetts in 2007, aged 84, following a stroke.
 place of death: Brian MacMahon, Boston
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: place of death, place of birth, education degree, education institution 
Text: {0} 
Answer:
 place of death: Brian MacMahon, Boston