There are genetic and environmental aspects to Parkinson's disease and so much is unknown. My condolences to you for the loss of your sister at such a young age. That is quite unusual, as far as I know.
I do know that medications can have many side effects and not all of them are known for decades after we introduce them. Also, interactions play a part. If you find out more, we'd appreciate anything you have to share about this unusally young death from Parkinson's.
Again, I'm so sorry you've had to go through this.
Blessings,
Carol
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