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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.
What else can I help you with?
What relation is your grandfathers sisters son to you?
cousin
What is your relationship to your grandfathers cousin's husband?
Your grandfather's cousin is your cousin twice removed. Her husband has no direct relationship to you.
What relation is your grandfathers nephews son to you?
3rd cousin
Is your grandpa's cousin's kid your cousin too?
Yes, you are related to your grnadfather's first cousin. Your grandpa's first cousin is your first cousin, twice removed.
What is your relationship to your grandfathers nephew?
Your grandfather's great nephew is your second cousin.
What relation is your grandfathers nieces son to you?
Your grandfather's niece is a first cousin of one of your parents. Her son is your second cousin.
How are you related to your grandfathers sisters grandchildren?
Your grandfathers' sisters' grandchildren are your second cousins.
What is my grandfathers brother relations to my son?
Your daughter's grandfather's brother's son is her mother's or father's first cousin and her first cousin, once removed.
What relation to you is your grandfathers cousins son?
Your grandmother is first cousins with cousin. Your parent would be the second cousin of the cousin's son. That would make you second cousins once removed.
In what circumstance is the cousin of your cousin related to you?
The cousin of your cousin is related to you if you share a common ancestor, such as if you are all descended from the same great grand father. If the cousin of your sousin is related to your cousin through a person to whom YOU are not related, then you are not related to the cousin of your cousin.
What relation is your grandfather's niece to you?
Your grandfather's sister is your great aunt.
How are you related to your cousin's wife?
You are not related to your cousin's wife.
