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little did these naive people realize at the time that they were embracing a foul brood of ungrateful vipers , which would soon prove to be their undoing .
 member collection: brood, vipers
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  brood, vipers 
Answer:
 member collection: brood, vipers