You and your father's cousin's granddaughter are 2nd cousins once removed.
Your first cousin's granddaughter is your first cousin, twice removed.
Your third cousin.
Your granddaughter and your first cousin are first cousins, twice removed, to each other.
Your great aunt is the sister of your great grandparent. Her granddaughter is your second cousin and her great granddaughter is your second cousin, once removed.
Your son and your first cousin's granddaughter are second cousins, once removed, to each other.
Your grandfather's great great granddaughter could be:your granddaughteryour great niecefirst cousin, twice removed
Your 1st cousin's granddaughter would be your daughter's niece.
Your grandfather's brother is your great uncle. Your great uncle's daughter's daughter (his granddaughter) is your second cousin.
Some of your granddaughter's first cousins are also your grandchildren, others are not related to you at all.
Your uncle's great granddaughter is your first cousin, twice removed.
Your mothers sisters Granddaughter is your second cousin
Your granddaughter and your second cousin are second cousins, twice removed, to each other.