kissing cousin

noun
1
a distant relative who you know well enough to kiss when you meet them
بستگان نسبتا دور که نزدیکی دارند, خویشاوند دور اما نزدیک
2
something that is a lot like something else
چیز مشابه, چیز همسان, چیز همانند
There is a popular idea that creativity and madness are kissing cousins.