YOU SAID:
As your father I expressly forbid it
INTO JAPANESE
あなたの父親として、私はそれを禁じます
BACK INTO ENGLISH
As your father, I forbid it
INTO JAPANESE
あなたの父親として、私はそれを禁じます
BACK INTO ENGLISH
As your father, I forbid it
That didn't even make that much sense in English.