The other day one of my sons , Mark asked me about what sounded like a resting tremor in his left hand. Since this seemed to be a very occasional thing I told him to keep a record of the occasions , but not to be to concerned. I got to thinking about Mark, Then I started to worry about Mark. Now I am starting to worry about Mark's Identical twin brother Ken. Mark and Ken are 35 years old . I was diognosed with Parkinsons when I was about 57. Does anyone have any thoughts. Thanks for listening Ted Nelson