We r brothers, but we have little (few) in common.请问是用little 吗

few, a few, little, a little 虽然都表示“少”，但few, a few是可数的, little, a little是不可数的。其中few表示否定

是 表示抽象不可数

是little. common 表示“相同之处”,不可数。

是的根据习语have much in common ,所以have little in common

we have little in common

用a few的话要+only 和subject. 如
but we only have a few hobbies in common.