Fighting siblings

My mom used to have this newspaper clipping on the refrigerator of the "Toddler Mantra" that went something like this:

If it's mine, it's mine. 

If it's yours, it's actually mine.

If it's yours, but it looks like mine, it's mine.

If it's mine, but you want it, it's mine.

If you don't want it, it's mine.

If I don't want it, it's mine.

These boys are already at it. The sibling struggles have begun. Hank always wants whatever Johnny has and Johnny always wants whatever Hank has. The trouble is that Johnny is much more able than Hank is and always wins... whether it's his toy or not. We've been trying to work on what is Hank's Johnny can't have (unless Hank is done with it), but what is Johnny's Johnny can have. It's a tough concept for a 2 year old.

"Hey Hank! That's mine! Let go!"

"Johnny, I had that first! Give it back!"

"Mom, did you see what Johnny did?!"

Back to normal with more age appropriate toys.