I'm sorry that I can't help you because I cant't speak any korean But if you have any question about Chinese , I can help you .

I am not good at english, so I am not sure if I can answer I explain you as much as I know. mother 어머니 (Usually, you can talk "mom" 엄마) father 아버지 (Usually, you can talk "dad" 아빠) grand mother 할머니 grand father 할아버지 one's maternal grandmother 외할머니 one's maternal grandfather 외할아버지 aunt 이모, 고모 one's father's elder brother 큰아버지 one's father's younger brother 작은아버지 the wife of one's father's elder brother. 큰어머니 niece 여조카 nephew 남조카 (These expressions are same in Korea, but just differeny of sex) sister 여동생 brother 남동생 (These expressions are same in Korea, but just differeny of sex) Actually, In Korean culture, There are numerous expression that you adress someone elses family member So I can't teach you all of the things but I wirte some expression. If you want to learn Korean more, just contatc me