You should ensure the house is arranged in a manner that could reduce falling and or slipping. Contact the doctor because a disease that affects the brain can be risky. His meals should contain 1500 to 2000 calories daily. Visit http://www.drugs.com/cg/parkinson-s-disease.html.
If it is Parkinson's, it's difficult to know your chances of also having it. My dad's dad had it, but so far, none of his kids or grandkids have it (including my dad, his two sisters, my brother, my sister, my 3 cousins, & me).