Correct

相认

/ xiāngrèn / 
Strokes

Definition

to know each other/to recognize/to identify/to acknowledge (an old relationship)

Example

As a Verb

be acquainted with each other; know

1
Wǒmen
我们
gēnběn
根本
bù
不
xiāngrèn
相认
  
。

We don't know each other at all.

As a Verb

recognize; identify

2
Lísàn
离散
duōnián
多年
yǐhòu
以后
  
,
fùzǐ
父子
liǎ
俩
chóngxīn
重新
xiāng
相
rèn
认
le
了
  
。

The father and son resumed their relationship after a long separation.

3
Nányǐ
难以
xiāng
相
rèn
认

be difficult to recognize; be hardly recognizable