My hands have always shaked. It's gotten worse in the last 5 yrs and now my 3 yr olds shake too. Help!?

I was tested for Diabetes and its been negative, and I"m only 23 so it couldn't be parkinsons. I've heard of WIlson's Disease but I don't have all the symptoms. My hands shake a lot but my old doctor *who wasnt very good* just told me it was bad nerves.....
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