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

Problem

Answer published by the source. Consult the official source to check your work against its answer.

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: First of all, whoever is not a half-brother of Steven is a great-grandfather of Craig. Next, there is somebody who is a great-grandfather of Craig and, in addition, not an ancestor of Jordon or not a stepbrother of Gustavo. It follows that not every half-brother of Steven is both an ancestor of Jordon and a stepbrother of Gustavo."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
40adba4e-b681-524b-a83d-b62e05c5a265
task_key
formal~5ffallacies--main--40adba4e-b681-524b-a83d-b62e05c5a265
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import