Boys will be boys. I guess this isn't exclusive to the human race. Duke and Otis get up to all sorts of antics just like my two boys, my two brothers, the Scouts... and just about any group of males I know. It's always entertaining. Sometimes they love each other and are so sweet and endearing. Other times I'm pretty certain they're going to hurt each other with their rough housing.
The other night, Secundogeniture sent me this picture.
I don't think this is going to end well.