After their retirement, my parents loved to walk along the pathways in the nearby state park. It was there they noticed the first signs. My mom said she noticed my father wasn’t swinging one of his arms while walking and he was stumbling over small roots. Soon after they came to visit me in California, and I noticed it, too. I asked my mom if she thought Dad had had a small stroke. I noticed his arm was not swinging and his hand was clenched. It seemed like my dad had a bit of a blank stare when he wasn’t talking. They promised they would go to the doctor when they returned home. Their general physician couldn’t find anything wrong. Then my mom asked, “Could it be Parkinson’s?” The doctor didn’t know but suggested they see a neurologist. My mom and dad walked into the neurologist’s office and sat down. Before they said anything the neurologist told them my dad had Parkinson’s disease. My dad had the classic Parkinson’s gait and a closed hand to help neutralize tremors. The...