This is certainly not a "legal opinion," but in my personal view, the idea that CM's family is somehow stepping over the legal line in protesting and asking for answers, and at risk of incurring a lawsuit, is incredibly silly.
The law matters. Details matter. The differences in what the Smolinskis did, and what's happening here, are huge.
The Arochi's are not being accused by CM's family of involvement in CM's disappearance, nor any other illegalities. They are simply asking EA's family to get answers from him that he won't provide. From how I see it, they have every right to keep asking within certain general boundaries.
Are they protesting at night and disturbing sleep? Nope. Are they trespassing on private property? Nope. Are they using bullhorns or other obtrusive noise to bother the Arochi's and their neighbors? Nope.
The concept of having a right to protest in a way that makes someone else uncomfortable, to insist on an answer where none is being supplied, is certainly part of the fabric of our society and within legal bounds. The first amendment protects the rights of the Morris family to legally protest and air their issues in public, where they may be seen or heard by the ones they wish to hear them.
We have to remember that this is the CIVILIZED way that "my family" tries to get things made right from someone in "your family." In other societies, and in other times, one family might take up arms against another, or one country against another, to get the scales balanced. Here, it's standing on a sidewalk with signs asking for answers - relatively speaking, this is NOT a big deal in the bigger picture.
While it may be a bother to the Arochi family, the truth is that free speech can indeed be a bother to those who would rather not hear you. But, the law says, to some extent it's too bad. As long as the protests stay within some general bounds (and it appears the Morris family is doing just that), they should be able to continue to "seek redress" from the Arochi's with their signs and presence, and hope it will bring the desired result.
