Although most often found in fiction books, you may also want to include a List of Characters in your blog to book project if it would be hard for the reader to keep track of the people and relationships in your story without a guide. You can organize the list by order of appearance or family groups or overlapping relationships, whichever would be most useful for the reader.
You can eliminate some of the confusion in your book by using the same nicknames or given names throughout the story. Don’t call the neighbor Fred in one chapter and Mr. Miller in the next. Be consistent.
It might be useful to include a genealogy in some situations especially if there is something unique about the family tree that pertains to the story. For instance, the main characters might be cousins twice removed that had met at a family reunion as children and reconnected as adults. Instead of going through the intricacies in the text, a mere mention with reference to the genealogy at the beginning of the book might suffice.
There are many free templates available online to help you create an attractive genealogy to include in your book.
Assignment: Create a List of Characters or Geneology for your book. Review your book to make sure you are consistent in name-use.