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But Mr. Wallace , 45 , a businessman and an investor in partnership for a time with Mark Thatcher , son of the former British Prime Minister Margaret Thatcher , has detractors , including his City Hall predecessor , Dean A. Hrbacek , a lawyer whom Mr. Wallace defeated in 2002 . ''
 children: Margaret Thatcher, Mark Thatcher
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:  Margaret Thatcher, Mark Thatcher 
Answer:
 children: Margaret Thatcher, Mark Thatcher