Participants will be asked to complete a family history questionnaire, which will gather information about their family history of Parkinson's disease and related disorders. They will be asked to complete a single Study Visit, during which they will be asked to do some or all of the following:
1. Complete questionnaires regarding Parkinson's disease symptoms, medical history, mood, sleep, mental status, and activity level.
2. Be given a brief standard neurological examination.
3. Be given a scratch and sniff smell identification test.
4. Be asked to give a sample of approximately 2 tablespoons of blood.
5. Be asked to give a urine sample of approximately 1 tablespoon of urine.
