Two distinctly different diseases. Though some people with PD (some studies show as many as 80 percent) will go on to develop dementia, it's not Alzheimer's.
Here are links to a couple of sites that offer information about this:
https://memory.ucsf.edu/dementia/parkinsons/par....
https://www.alz.org/alzheimers-dementia/what-is...
Hope this helps answer your questions.
I don’t know of anyone.