YOU SAID:

When will my parents be back

INTO JAPANESE

両親はいつ帰ってくるのか

BACK INTO ENGLISH

When will my parents come home?

INTO JAPANESE

両親はいつ帰ってきますか?

BACK INTO ENGLISH

When will my parents come back?

INTO JAPANESE

両親はいつ戻ってきますか?

BACK INTO ENGLISH

When will my parents come back?