Answer:
I would say because the sentence includes a compound noun because the hyphens are to connect "brother-in-law" which is multiple words acting as one word.
*Hope this helped : )*
Neorealist writing focused most on Political and Social issues<span />
<span>The violence directed at noncombatants was the main focus of some of the early twentieth-century American writers, such as Elie Wiesel. There were serious effects on the people who we not in combat during wartime.</span>
<span>The item that would be considered a musician's medium is D. song. A medium is the means through which, in this case, a musician communicates with his or her audience. So, the way that the musician wants to convey a message is through a medium in the form of a song that they prepare and sing to the people who want to hear it. </span>