That means you are related . But thre was some problems in the past . where your father
had separated from your friends father . But you are still related so go and say to your
friend my dear brother .
That makes you your friend's third cousin.
If your great grandfather's first cousin was the great grandfather of your friend, then you and your friend are fourth cousins to each other.
Your grandfather's niece is a first cousin of one of your parents. Her son is your second cousin.
Your daughter's grandfather's brother's son is her mother's or father's first cousin and her first cousin, once removed.
Your grandfather's sister is your great aunt.
Your grandfather's nephew would be your First Cousin once removed Ref: http://freepages.genealogy.rootsweb.ancestry.com/~gentutor/chart.html
Your grandfather's first cousin is your first cousin, twice removed.
Your grandfather's first cousin in your first cousin, twice removed.
It would technically be considered your half- cousin since you do have the same grandmother but a different grandfather.
Your grandfather's first cousin is your first cousin, twice removed. His second cousin is your second cousin, twice removed.
Your grandfather's first cousin is your first cousin, twice removed. His second cousin is your second cousin, twice removed.
Your great grandfather's nephew was your grandfather's first cousin. You are two generations removed from your grandfather and his cousin. Therefore you and your great grandfather's nephew are first cousins, twice removed.
Your grandfather's first cousin is your first cousin, twice removed. Your grandfather's second cousin is your second cousin, twice removed. Your grandfather's third cousin is your third cousin, twice removed. The relationship possibilities become more complex if you are talking about your grandfather's cousins who are once (or more) removed.
The son of your grandfather's First Cousin is your parent's Second Cousin and your Second Cousin, once removed. The grandson of your grandfather's First Cousin is your parent's Second Cousin, once removed, and your Third Cousin.