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The Rev. Franklin Graham , the son of the evangelist Billy Graham , visited Sri Lanka this week to encourage the workers of his evangelical aid organization , Samaritan 's Purse , who plan to work in Sri Lanka for the next five years .
 children: Billy Graham, Franklin Graham
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Billy Graham, Franklin Graham 
Answer:
 children: Billy Graham, Franklin Graham