Answer and Explanation:
The ideal would be to deal with this situation impartially and truthfully, presenting the message to the deaf person in an integral way, as it was issued, since veracity, clarity and impartiality are the essential and ethical elements that an interpreter must present at work. In that case, I would tell the deaf person the words that his or her father spoke. I could try to comfort the deaf person after my job as an interpreter has been completed and the conversation has ended. So I could confront this person as a friend who cares about his or her psychological well-being, but only with the conversation concluded because my professional duty would have ended.