if your mother slept with her father to conceive you
Your grandfather's father is your great grandfather.
Your father's grandfather is your great grandfather.
Your grandfather's father is your great grandfather.
Your grandfather's father is your great grandfather.
Yes, the father of your father is your "Paternal Grandfather".
Everyone has a grandfather, since they are your father's father.
Your father's grandfather is your great grandfather.
Your father's father is your grand father and your grandfather's father is your great grandfather.
your great grandfather
A grandfather is not a father-in-law if the parents (one of whom is a child of the grandfather) are not married.
your grandfather
A grandpa is a grandfather, the father of your father or mother.