Your brother's children call you their aunt if you are female, or their uncle if you are male. Their are your nieces and nephews.
If its a boy, nephew. Girl, niece.
because the girl sometimes wishes he was her brother.
Your mother's brother is your uncle; you are his niece (if you are a girl) or his nephew (if you are a boy).
Your father's brother is your uncle; you are his niece (if you are a girl) or his nephew (if you are a boy).
The baby of your brother is called your nephew if it's a boy and your niece if it's a girl. These terms denote the relationship between you and your brother's child.
Uce is a slang term for "uso" which means brother (or sister depending on who is saying the word, and who they're saying it to) If a girl says "uso" she can ONLY direct it at another girl (sister). If a girl needs to address her brother she would call him her "tuagane". If a boy says "uso" he can ONLY direct it at another boy (brother). If a boy needs to address his sister he would call her his "tuafafine".
My brother and my sister are pigs.
Hyung or Oppa. If a boy is talking to his older brother, he would call him "hyung". or "hyung ah yah. If a girl is talking to her older brother, she would call him "oppa".
Your brother's great grandchild is your great great nephew (if a boy) or great great niece (if a girl). You are their great great aunt.
a girl boy
Lad (boy) lass (girl)
He is a boy!! Please do not call him a girl, he would be offended!!