Welcome to HCM
We understand your concerns
I went through your problem description. I think you should not worry too much about this. This could be due to so many reasons. You can check yourself. Hold your both the arms fully extended and stretched and fingers open stretch and extended. Hold for two minutes and see they are shaking too much. If yes, you should consult a physician. Parkinson
is definitely a genetic problem but it gets more easily if it is paternal. Before confirming you should consult a doctor.
Hope this clears your doubts. Available for further clarifications.
Get well soon.