He sure is cute! 
  
Prince and Angel had very few accidents in the house before I got Noah.  Once I brought the second boy in, Prince starting marking his territory.  Two years later, both boys have to wear belly bands in the house because they are in an all out marking war 
  
They both mark at my parents' house too, but not at my brother's house.  Weird.  Maybe it's because they spend more time at my parents' house and consider it a second home? 
Prince and Angel won't play with Noah either.  They are both quite a bit older than him.  They were both adults when I got them and were not well socialized at all.  Neither one of them knew how to play with another dog.  Noah was 6 months old when I got him and lived to play so I think that irritated them a lot 
  
Hopefully with yours being so close in age and both still puppies, you won't have the same issues I did.  Good luck!