Family Quotes in The Red Pyramid

How we cite our quotes: (Chapter.Paragraph)

Quote #10

Understanding passed between us. I was surprised how easily I could read him. I thought it might be the influence of the gods, but then I realized it was because we were both Kanes, brother and sister. And Carter, god help me, was also my friend. (40.134)

They say that you can pick your friends, but you can't pick your family. It is awesomely lucky that Sadie ends up with both in her brother, Carter. This is yet another reason they make a great team. Can friends also be family? What are some of the ways this novel shows that you can build family?