Cat Siblings

My two cats are not related (to my knowledge), yet at times they act like brothers.  The younger one, Haty, is locked up at night due to his rambunctiousness.  Indy, the older one, will search for him some mornings, waiting to play.

Other times, Indy is grumping and can't stand having Haty around, so naturally, Haty makes a point of trying to get him to play.  Indy responds by meowing and running off.  If one is eating, the other one wants some too.

As I write this, Indy is trying to ignore Haty's attempt to play by not looking at him.  I don't think Haty is buying it.