What is the relationship between you and your fathers cousins granddaughter?

Answer 1

Your father's first cousin's child is your second cousin. Your father's first cousin's grandchild is your second cousin, once removed.

Your child and your father's first cousin's grandchild are third cousins to each other.

Answer 2

Your father's first cousin's daughter or son is your second cousin.

Your father's first cousin's grandson is your second cousin once removed. The parent of that grandson is your second cousin.

Answer 3

You and your father's cousin's granddaughter are 2nd cousins once removed.