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Your grandson is your brother-in-law's great nephew, and your brother-in-law is your grandson's great uncle.
What else can I help you with?
What is the relationship between your grandson and your brother's grandson?
Your grandson and your brother's grandson are second cousins to each other.
What is the relationship of your niece's grandson to you?
Your niece's grandson is are your great-grandnephew.
What relationship is your cousins grandson to your grandson?
Your first cousin's grandson son is your grandson's third cousin. Your second cousin's grandson is your grandson's fourth cousin. Etc., etc.
What is the relationship of your sister and your grandson?
Your sister would be your grandson's great aunt.
What relationship is your sister to your grandson?
Your sister is your grandson's great aunt. He is her great nephew.
What relationship is your great aunt's grandson?
Your great aunt's grandson is your second cousin.
What relationship is your grandson to your aunt?
You Aunt is you grandson's Great-Great Aunt. Your grandson is your Aunt's Great-Great Nephew.
What is the relationship of your grand niece to your grandson?
Your grand niece and your grandson are second cousins to each other
What is the relationship of your sister's child and your grandson?
Your sister's child and your grandson are first cousins once removed.
What relationship to your first cousin is your grandson?
Your grandson and your first cousin are first cousins, twice removed.
What is Relationship to my brothers grandson?
Second cousins.
What relationship is your brother's grandson to your son?
Nephew?!
