Adorable! I love how Kougyoku is poking Kouha (they are the same age, are they not?), and how nonchalant the oh-so-great future emperor is about having his little brother nap in his lap while discussing military affairs with his other bro. They all look a lot more normal here than they are in actuality -- especially our dear Third Prince! I could almost kiss that peaceful, angelic face of his... and then he might slice my ribcage open.
But aren't they from different mothers? I don't think they're twins. And yes, they sure do! One thing I like about the Ren family is the strong bond they share, and how loyal and loving they are when it comes to one another (especially Kouha towards his brothers). I wish they would have more moments like this one in the actual series!