How many sets of brothers have played for middlesbrough?

Middlesbrough Football Club has seen several sets of brothers play for the team over the years. Notable examples include the Hall family, with both John and his brother, and also the likes of the McMahon brothers, who featured in the 1980s and 1990s. While the exact number may vary depending on the definition of "sets" and the eras considered, it is generally recognized that at least a handful of brother pairs have represented the club. For the most accurate and detailed count, a comprehensive historical review would be needed.