YOU SAID:

I can only say who's in my living room

INTO JAPANESE

誰が居間にいるのかしか言えない

BACK INTO ENGLISH

I can only tell who is in the living room

INTO JAPANESE

居間に誰がいるかしか分からない

BACK INTO ENGLISH

I only know who is in the living room

INTO JAPANESE

居間に誰がいるかしか知らない

BACK INTO ENGLISH

I only know who is in the living room