There are no blood relatives. Gehrig was the only child of his parents surviving into adulthood, and he had no children of his own.
The study seems to focus on soldiers who suffered significant head trauma. I don't think it's easy to relate that to sports injuries. If Gehrig were not suffering from ALS, I think that statistically a number of other ballplayers would have been thus "diagnosed." That is not the case, which leads me to believe the disease is properly named.
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