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One's sister's daughter, or one's brother's dayghter all called niece.
The daughter of your father's brother (of your uncle) is your first cousin .
If it is your biological father's daughters, they are your sisters, (siblings).
If it is your step-father, they they are your step-sisters.
your 5th cousin
Your father's brother's son is your first cousin and your daughter's second cousin.
Your daughter is your brother's niece. Your brother is your daughter's uncle
Your brother's daughter has a daughter? That is a great niece.
Your brother's daughter is your niece. Her daughter is your great niece.
Your brother's daughter and your daughter are first cousins to each other. Your brother's daughter and your daughter's daughter (your granddaughter) are first cousins, once removed, to each other.
thts really bad
Your brother or sister's daughter is called 'your niece.'
This is the way it goes: Your fathers elder brother is YOUR Uncle,his grand daugher is YOUR first cousins daughter. So this grand daughter who is your first cousins daughter would be YOUR SECOND COUSIN.
Your brother's sister is your daughter's aunt, and your daughter is your brother's, and his sister's, niece.
your brother's daughter is you niece
Your fathers brother is your uncle.