The PROGENI Family Study is part of a larger consortium that is studying a gene shown to be important in Parkinson's disease, called LRRK2. People who have a defect in the LRRK2 gene will often develop Parkinson's disease. Eligible participants will be asked to complete a single Study Visit at an affiliated research facility closest to their home.

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.

Inclusion Criteria:

Positive for a LRRK2 mutation

Participants must provide test results documenting a LRRK2 mutation.