YOU SAID:

i am going to murder a family of four

INTO JAPANESE

一家4人を殺害するつもりだ

BACK INTO ENGLISH

I'm going to kill a family of four.

INTO JAPANESE

一家4人を殺すつもりだ。

BACK INTO ENGLISH

He plans to kill a family of four.

INTO JAPANESE

彼は一家4人を殺害する計画を立てている。

BACK INTO ENGLISH

He plans to murder a family of four.

INTO JAPANESE

彼は一家4人殺害を計画している。

BACK INTO ENGLISH

He plans to murder a family of four.