The pronoun 人家
人家 is interchangeable with some words. Let's consider which ones.
The pronoun 人家 
has several meanings:
1) other people
has several meanings:
1) other people Pay attention
In this meaning, 人家 is interchangeable with 别人 .
.Examples
我不在乎人家怎么说
I don't care what people say
wǒ bú zàihu rénjiā zěnme shuō
放心吧，我不会告诉大家的
Don't worry, I won't tell anyone
fàngxīn ba, wǒ bú huì gàosu dàjiā de
2) he, she, they
人家 can be used in this meaning when referring to someone previously referred to or it can refer to a somebody that both the speaker and listener know.
Examples
你这么喜欢他，告诉人家了吗？
Did you tell him that you liked him so much?
nǐ zhème xǐhuan tā, gàosu rénjiā le ma
你看人家多聪明！
Look how clever he is!
nǐ kàn rénjiā duō cōngmíng
3) I, me
人家 is often used this way by women, giving it a sort of girly, shy, tender feeling.
Examples
走吧，宝贝 —— 不，人家要那个娃娃
Let's go, honey — No, I want that doll
zǒu ba, bǎobèi — bù, rénjiā yào nàge wáwa
讨厌！老是拿人家开玩笑！
I hate it! You always make fun of me!
tǎoyàn! lǎoshì ná rénjiā kāiwánxiào
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