I would think that it was cute that he is always watching out for his sissy, except for the fact that he is always watching out for his sissy.
"Don't touch that! Don't do that! That's my Mommy!" Oh, Lord! What is going to happen once she starts walking? He already whacked her in the face with a frog balloon just for moving towards it.
Let's just go through the list of conversations that are repeatedly had with the Boy through out the day, shall we...
1. The Sharing Talk
2. The You Don't Hit Your Sister/Dog/Mommy Talk
3. The Don't Scream In Your Sister's Face Talk
4. The Where Are Your Pants Talk (A little off topic, but I have this one about 16 times a day so I thought I might throw it in there)
The poor kid spends his entire day worrying about what his sister is doing, getting, moving towards that I think he is going to, or already has had, a mental break!
Dude, let Mommy worry about sister, you worry about yourself. For example: where the heck have your pants gone and what are you doing with that spatula?