The children [i.e., members] of your chosen sister [i.e., church] send you their greetings. [See verse 1].
And if you greet [cordially] your brothers only, what are you doing more than other people? Do not even the [unconverted] Gentiles do that much?
Your sister [church] here in Babylon, [also] chosen [by God], as you have been, sends her greetings along with my [spiritual] son Mark.