Perry County Missouri Cashions

I am looking for ancestors of my grandfather.I never knew him that well, but know that he and his family were from Perry County Missouri, possibly Perriville.His full name was Frank Gilbert Cashion Sr.I know he had some brothers, and possibly either he or his brothers were twins(?) with one of the twins dying young but I don't know much else about his family.He died last year at 96.I am knew to this so any help would be appreciated