New words：

niece [nis] n. 侄女；外甥女
nephew [ˈnefju] n. 侄子；外甥

Sample Sentences：

My mother's nieces are my cousins.
Someone's nephew is the son of their sister or brother.
When he died, his young nephew was the only heir to his great wealth.

cousin [ˈkʌz(ə)n] n. 表妹；表兄；堂兄；远亲；远房亲戚；同辈表亲
heir [er] n. 继承人；后嗣；传人

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