YOU SAID:

I killed my mother of 3.

INTO JAPANESE

3児の母を殺しました。

BACK INTO ENGLISH

He killed a mother of three.

INTO JAPANESE

彼は3人の子供の母親を殺害した。

BACK INTO ENGLISH

He murdered the mother of his three children.

INTO JAPANESE

彼は3人の子供の母親を殺害した。

BACK INTO ENGLISH

He murdered the mother of his three children.