YOU SAID:
They do not know who know who does
INTO JAPANESE
彼らは誰が誰を知っているか分からない
BACK INTO ENGLISH
They do not know who knows who
INTO JAPANESE
彼らは誰が誰を知っているのか分からない
BACK INTO ENGLISH
They do not know who knows who
Okay, I get it, you like Translation Party.