He most likely is referring to that one of his family was killed/ as in murdered, suicide, or more! I'm sorry if I couldn't completely answer your question!
Answer:
Prove a position
Explanation:
An author's purpose in an argument is to "prove a position." In order to do this, he tries to persuade the readers by<em> providing evidence</em> which supports his claim or position. It makes his stance clear by providing statements that will support his <u>point-of-view.</u> This is often used in "controversial issues."
So, this explains the answer.
