According to QCTimes.com they are not related.
Don Doxsie said, "Claude 'Butch' Harmon is originally from New York, but he has Quad-Cities ties and is one of the most famous Golf teachers ever. The information I found online lists his wife's name as Lillie. He is not, however, related to Brian Harman in any way.
https://qctimes.com/news/local/ask-the-times/ask-the-times-these-businesses-have-operated-at-1136-w-2nd/article_9086c61c-84ef-53cd-900a-665eed294b84.html
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