There were actually two sets of brothers in Lucky Luke. The first appeared in the 1954 story “Outlaws,” and were directly based on the historical Dalton Gang.
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Lots more samples of that story here:
https://www.google.com/search?q=Lucky+Luke+1954+story+"Outlaws"&udm=2
The second set of brothers (Joe, William, Jack and Averall) didn’t properly appear until four years later, in 1958. More on all that:
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