I’m quite sure H.E. did not have Parkinson’s. Had it been Parkinson’s, he would have had much more severe symptoms by age 84. He had an Essential Tremor, probably caused by a slight anomaly on one gene. It usually appears in one’s 40’s and can gradually get worse—or not. There is no cure, but a few treatments that can help if it begins to seriously impede one’s life. I don’t know if the bishop’s was treated. The usual is a Beta blocker or low dose benzodiazepine.
It doesn’t matter because I don’t think he has it anymore!