Nieces.
Granddaughter
your uncles daughter would be your cousin
Your grandson.
Your uncles daughter would be your cousin.
your uncles daughter would be your cousin
You call your daughter's baby, your grand-duaghter.
You would call your sister's daughter your niece.
They'd be your cousin.
Your uncle/aunt's son/daughter is an adult and you are still small, your uncle/aunt's daughter had a child, and that child will call you uncle. Uncles/aunts are your dad/mom's siblings.
Your grandson.
your auntie.. your sisters father is your dad..your dads brother is your uncle..your uncles daughter is your cousin and your cousins mother is your auntie:)!