What can i do if my dad has parkinson disease and i'm very curious. how can you distinguish it really?

Motor Symptoms below: There are various symptoms, but some of the most common are: resting tremor--this is a tremor that is worse when the patient's limb is resting, and it disappears when he moves it. Rigidity--the arm is stiffer than normal. Note that the above symptoms are usually asymmetrical, particularly at the start of the disease. There may be reduced armswing when walking. There may be a general slowness.