He would be your paternal great grandfather
cousin
3rd cousin
Your great great grandfather.
Your father's grandfather is your great grandfather.
Most likely they would not be related to you
A relation on your father's side of your family is called a paternal relation.
A file were you store dead cut up grandfathers!
Your grandfather's niece is a first cousin of one of your parents. Her son is your second cousin.
Your grandfather's sister is your great aunt.
"Paternal" means "on your father's side". Your paternal great-grandfather would be one of your father's grandfathers.
Jim Burden's grandfathers farmhand, not his fathers. Jim's father farm hand
Amelia Earhart's paternal grandfather - that is, her father's father - was David Earhart. Her maternal grandfather was Alfred Otis.