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 On April 10 , the mother-and-daughter suspense novelists Mary Higgins Clark and Carol Higgins Clark signed books and posed for photographs for five hours here , with some fans waiting in line for up to two hours . 
 children: Mary Higgins Clark, Carol Higgins Clark
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
 Entity Pairs:  Mary Higgins Clark, Carol Higgins Clark 
Answer:
 children: Mary Higgins Clark, Carol Higgins Clark