I don't know if you guys are saving this for later but I'd like to point out that Eleanor Porter is Barbara Black's sister, and Bobby Black's aunt. There's a significance to her wanting to plant a tree on Weer's grave that's easy enough to discover and which you'll probably cover in the recap.
At the beginning of one of the "Indian Princesses" sections there is a paragraph: 'Barbara's sister Eleanor says, "All right we can write on that...'
Earlier, we find this: "Mrs. Black and Miss Bold, sisters..."