What's theirs is theirs and what's yours is theirs. Even without them taking it, your stuff becomes theirs. I search my kitchen for specific Tupperware items before remembering they are in the living room with seeds, various types of pellets or treats in them. He has his own scissors in his tub of toys/spare food so I don't have to go to the kitchen for a pair each time I need them for his millet or to open a bag. Lots of our things seem to have become his, but it is okay. After all, he is king of the castle.
CUTIE has taken my bed..i have to sleep on ground as he will throw all kinds of seeds and millet on me and note my reaction when i asleep on bed beside his cage..so i have decided to sleep on ground instead of bed to sleep peacfully for atleast 6 hours at night when he is still awake doing all sorts of what in his language is playing hide and seek with seeds..and finding them when they fall from his cage