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BIG-Bench Hard / Is Fred a cousin of Robert? Is Joe related to Bob? In large families, it is…

Problem

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input

"Is Fred a cousin of Robert? Is Joe related to Bob? In large families, it is sometimes difficult to keep track of all one's relatives. The following argument seeks to clarify some such relations: To start with, Darwin is a grandson of Dewayne. Now, whoever is not both a half-brother of Alvin and a grandson of Dewayne is an ancestor of Leslie. It follows that it is false that Darwin is an ancestor of Leslie."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
330d9ac6-bb10-5599-afe7-05a52b704aae
task_key
formal~5ffallacies--main--330d9ac6-bb10-5599-afe7-05a52b704aae
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import