Are you Clark or Owen?

'Are you Clark or Owen'?- A common phrase when my two little cousins visit. 

I usually just try to pick up on what they call each other then remember what color shirt each is wearing.

 I think I am finally starting to get it though. 

Here are the crazy boys at mom and dad's place attempting to slip-n-slide, shoot one another with water guns, and play tag, all while fighting off my brother's boxer.  =)