I too have noticed the discrepancies as well.
According to John Mahey's report on Rootsweb, Fred was the son of James. But both his birth certificate and his death certificate, which are available on FamilySearch.org, list Matt S. Cyrus as his father. So I am confused as well.
My link to this family is Fred's daughter, Audrey Junella. Junella was my father-in-law's biological mother. He was later adopted by the Davis family.