YOU SAID:
What, is someone in your house?
INTO JAPANESE
なに、あなたの家に誰かいますか?
BACK INTO ENGLISH
What is anyone in your house?
INTO JAPANESE
あなたの家には誰がいますか?
BACK INTO ENGLISH
Who is in your house?
INTO JAPANESE
あなたの家には誰がいますか?
BACK INTO ENGLISH
Who is in your house?
That didn't even make that much sense in English.