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Your great uncle is the brother of your grandmother or grandfather. Therefore you and your great uncle's grandson share one or two great grandparents, and you are both the same number of generations separated from that shared ancestor.
So you are second cousins to each other.
What else can I help you with?
What relationship are you to each other if your great grandfathers were brothers?
He would be your great-great uncle.
What relationship is my son to my brothers daughters child?
Your grandson is the great-nephew of your brother.
What relationship are your grandfathers brothers kids to you?
Your grandfather's brothers would be the uncles of your parent. That would make them your great uncle.
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 brother and your great grandson?
Your brother is a great great uncle to your great grandson. Your great grandson is your brother's great great nephew.
what is my 3rd great grandfathers brothers son to me?
What is your great-great-great grand nephew?!
What relationship is your great aunt's grandson?
Your great aunt's grandson is your second cousin.
What relationship is your sister to your grandson?
Your sister is your grandson's great aunt. He is her great nephew.
What is the relationship of your niece's grandson to you?
Your niece's grandson is are your great-grandnephew.
What relationship to you is your great grandfathers sons daughter?
She would be your great grandmother
What relationship is a sisters child to a brothers great grandchild?
Your sister's great grandson is your great great nephew. You are his great great uncle, or great great aunt.
What relationship is your great aunt's great grandson to you?
Your great aunt's great grandson is your second cousin, once removed.
