In English interpersonal relationship is easier than in Chinese . specially is “uncle ” and “aunt ” , how to distinguish them . Use “uncle ” or  “aunt” before they name , like this ,uncle Tom , aunt marry .If you don’t know how to say this ,you can also call them by name , call they name not impolite .In China ,if someone elder than you ,you call they name is impolite .It’s different culture .

Interpersonal relationship 

• colleague 
• partner 
• daughter  / son 
• child  / children
• father  / mother   
•  elder brother（哥哥） /younger brother（弟弟） / brothers (兄弟)
• elder sister（姐姐） / younger sister（妹妹） / sisters (姐妹)
• siblings  (兄弟姐妹)
• spouses（配偶）
• uncle  (叔叔，伯伯，舅舅) 
• aunt  (姑姑，阿姨，伯母，婶婶)
• sister in law （妯娌）
• brother in law （大伯子，小叔子，姐夫，妹夫）
• grandson  / granddaughter 
• grandfather / grandmother 
• niece (侄女，外甥女)
• nephew (侄子，外甥)
• father in law 
• mother in law 
• son in law （女婿）
• daughter in law （儿媳妇）
• step sister / step brother  
• half sister  / half brother (同父异母，同母异父)