Well, based on the title, 'the family upstairs novel' might be centered around the experiences, stories, and interactions of a family residing upstairs. It could explore themes like family relationships, power dynamics within the family, and maybe some external factors that are influencing this family. For example, it might tell a story of a family that has moved into a new place upstairs and how they interact with their neighbors, or it could be about a long - established family upstairs that has a lot of internal drama which slowly unfolds in the course of the novel.
I haven't read it in detail, but generally, this type of novel often delves into the relationships within the family. It could be about a family that has some dark past or present issues that are gradually uncovered as the story progresses. There might be elements of suspense as the reader tries to figure out what's really going on with this family upstairs.