Correct

先不先

/ xiān bù xiān / 
Strokes

Definition

(dialect) first of all/in the first place

Example

As a Conjunction

first of all; firstly; first; in the first place

1
Tāmen
他们
líhūn
离婚
yuányīn
原因
hěnduō
很多
  
,
xiān
先
bù
不
xiānshì
先是
jiātíng
家庭
bàolì
暴力
  
,
háiyǒu
还有
jiùshì
就是
xùjiǔ
酗酒
  
。

Several things led up to the divorce. There was the violence first of all, and also the drinking.