YOU SAID:
He was a casualty to my will.
INTO JAPANESE
彼は、私の意志に死傷者だった。
BACK INTO ENGLISH
He's my son.
INTO JAPANESE
俺の息子だ
BACK INTO ENGLISH
He was my son.
INTO JAPANESE
俺の息子だ
BACK INTO ENGLISH
He was my son.
That didn't even make that much sense in English.