I would get your Dad a free kit at 23 and me. If he has a Parkinson's gene mutation, that would mean free kits to all his first degree blood relatives, including you.

Having the mutation does not mean you will get PD. Good info to have, though.

Understanding risk factors for Parkinson's disease is a big priority for MJFF. Not only does it better inform patients and families about the cause and diagnosis of the disease but it we believe it is essential information in the effort to improve treatments for PD. Without better understanding early PD and how PD progresses, we are hamstrung in developing disease modifying treatments.

Here is information on understanding Parkinson's disease which includes information on risk factors and what can be done to reduce risks of getting PD. Be sure to "open" the various FAQ's and you will get information on everything from "causes" to a "screening questionnaire".
https://www.michaeljfox.org/understa...e-got-what.php

Here is more information on genetic risk factors for Parkinson's disease.
https://www.michaeljfox.org/understa...c.php?genetics

Note that your Dad (and all PD patients) are entitled to a free lifetime membership at 23andMe. More here: https://www.23andme.com/pd/

Here is more information on living with Parkinson's disease, which included information on
https://www.michaeljfox.org/understa...g-with-pd.html

Hope this helps...

Debi