Your great uncle's kids are your parent's first cousins. His grandchildren are your second cousins.
The grandchildren of any of your great uncles and great aunts are your second cousins.
First cousins, twice removed. Aunts daughter is your cousin. Aunts daughters daughter is cousin once removed Aunts daughters daughters daughter is cousin twice removed.
Your daughter's uncle can be your brother. Her parent who is not your sibling (your brother-in-law or sister-in-law) could also have brothers. They will also be your daughter's uncles, but will not be related to you.
To your sister's daughter you are an aunt (or uncle) and she is your niece. To your niece's daughter ( your sister's granddaughter) you are a great-aunt (or great-uncle) and she is your grand-niece.
Your aunt is your child's Great Aunt, so your child is her great niece or great nephew.
great uncle
Your brother's daughter's daughter is your great niece.
Second cousin, twice removed
I believe they would be great aunts or great uncles.
First answer:that would be your second cousin. It is legal in the united states to marry them due to genetics Second answer:Your question is: "What is the relationship of your uncles son daughter to you?" If you are asking, "What is the relationship of your uncle's son and daughter to you?" they are your first cousins.If you are asking, "What is the relationship of your uncle's son's daughter to you?" she is your first cousin once removed.
no he have no daughter or son
great grandson