According to the 1900 Baker County Florida census it
list;

John J. Davis -Born Dec 1852 - Fl - Farmer
Martha - Born - Jan 1854 - Fl
Ozzie - Son- Born Sept 1881 - Fl
Ollie- Daughter - Born March 1884 - Fl
Owen - Son -Born Sept 1886 - Fl
Emily - Daughter- Born Jan 1888 - Fl
Gilford- Son Born Dec 1890 - Fl
Phinny- Son Born Nov 1894 - Fl
Ether - Daughter - Born Sept 1898 - Fl

John Jack Davis married Martha Dorman .The 1900 census
states they were married at that time 25 years, and had
8 out of 10 living children. It also states that both of
John's parents were born in Georgia, and Martha's were
both born in Alabama.

The parents of John Jack Davis are John C. Davis and
Mary Ann Harvey, the daughter of John Harvey .

You can view their headstones at Find A Grave. They are
buried at Cedar Creek Cem in Sanderson, Baker County,Fl
where you will find many of the Davis burials entered
including Plen L. Davis.Hope this helps.