Perception

[Adam]

The difference is you've got to stop somewhere. If an ump would change a call for his brother, he'd change a call for a graduate of his college, or high school, or whatever. Like I said, it would have to be case by case, and I'd understand if they said an uncle/nephew relationship was too close. Uncle/nephew is marginal, I think brothers are too close.
As I said, I don't think the ump would actually change a call, there's too much scrutiny to do it. However, the average fan doesn't know that, and would see the conflict and overly scrutinize the calls.