I have twins, it is fascinating watching them grow up together. So, I couldn't imagine them ever being separated and the effect that would have. There are some interesting facts about twins, definitely a social dynamic that can be entertaining.
I'm glad Sadie stole every scene, I like writing animals into my stories.
I 'think' the rest is explained in later chapters, so I'm not going to spoil that for you. If not, I may have to expand the story a bit from where it is... only time will tell.
Thanks for reading!