外甥的英文：
sister's son
wife's sibling's son

参考例句：

I'm making a paper lantern for my nephew.
我做了个纸灯笼给我的外甥。

Let my nephew and Goldthred swagger about their wager as they list.
让我外甥和戈德斯雷德去信口开河地打赌，随他们的便吧。

sister是什么意思：
n. 姐妹；修女；护士
v. 姐妹般对待
adj. 姐妹般的；同类型的

The elder sister is called Mary.
姐姐名叫玛丽。

It is unnatural for sisters to be at variance.
姐妹之间不和是不近人情的。

The girl in red is his younger sister.
那个穿红衣服的女孩是他妹妹。

son是什么意思：
n. 儿子；年轻人，孩子；男性后裔，子孙；圣子

The plan was to have an audience of the son of Heaven.
计划里是有觐见天子的环节的。

Where are you from, my son?
小兄弟，你是哪里人？

The child is a treasure of a son.
那孩子是一个宝贝儿子。

wife是什么意思：
n. 已婚女子，妻子

Ann was cast as the wife.
安妮被选派扮演妻子的角色。

My wife was there among others.
我妻子和其他一些人在那儿。

The wife is the key of the house
妻子是家庭的关键