Secret love for his sister? lol

Erik on a daily basis states that he can't stand Olivia on days that end with "y" - lol.  My sweet little boy gets so wound up and upset with his sister.  And oh my gosh does he get fresh!  Why?  Because she wants to do everything he does.  Seriously.  She will watch the way he reacts to food she hasn't seen before and even if she likes it, she will try to mimic his reactions.  She wants to take a bath with him every day.  The only thing they don't do together is watch TV.  Olivia only sits still for the Wiggles and Signing Time and Erik loves cartoons (if there are no humans, she will NOT watch it).  Photo shoots have her usually looking at him to see how he is smiling.  If he touches her cars or trucks, she flips out (I think because he does that to HER).  He is rough with her, but she doesn't mind it at all (we watched the kids in her orphanage rough house).  He tells her what to do ALL the time (and she does it, well usually).  She never hugs him (or us) - but I think their bond is stronger than the bond between Olivia and us two adults.  Erik drew the picture below yesterday.  On a rough day with her no less.  He won't admit it to anyone, but I think he secretly is starting to like the little "annoying" bundle of energy.  :)