Do you have constipation or gastroparesis?

Hello. Hope ok for me to post here. Grandfather has Parkinsons - progressing more quickly as of late. Trying to understand the condition best i can. I have heard from my own gastroenterologist that PD can cause slow motility through the whole GI tract. I myself have severe gastroparesis and am wondering if this is likely to be something my grandpa is experiencing on any level whether symptomatically or not. Would appreciate any input. Thank you.