Yep..sounds all too familiar. I know that Kai knows better than to go inside the house but he still does. Well what helped was that since kai soiled at the basement everytime, I blocked off the entrance. It helped. Then what I also did was I increased the praise ALOT more...people look at me strange when they walk by the house and I say "GOOD BOY KAI! GOOD BOY! NICE POOP! GOOD JOB!" but...it helped him anyways. Hmm...well these may not apply to you because yours does sound like an attention thing..but remember that if they do soil inside the house, do NOT let them see you clean it. It'll become a game.
Good luck!