Re: obsession?
My little brother was OBSESSED with cooking, he always wanted a pot and spoon and to stir it around....but not on the floor or on the bed but on the cooker!
My mum would go insane with worry but the way she got him out of the habit was let him help her with cooking...i think he wanted to be like her..so he would pass her stuff.
Maybe you can tell him to pass you the clothes....or maybe you could iron together? so him on his toy one at the same time?
Im not a mummy so im probs completely wrong haha