
Its definately NOT attention seeking!
Its highly likely (how old is he now?) that this is part of him maturing, about him knowing its his house etc etc.. i know Pteppic has peed on our sofas a couple of times, and both times in the place i most frequently sit!
If you dont catch him in the act, there is nothing you can say or do to teach him anything, and shouting or scolding will possibly make things worse.
If you DO catch him in the act, say NO and take him outside.
Couple that with actually going WITH him when he is let out to toilet (hard i know when you have Bethany to mind as well) and reward him really well for going out there.
It should settle down as he matures though.
Em