Even the cat has been getting a lesson in sharing. Whenever she has the temerity to play with any of Chet's toys - she has a habit of flicking them under the couch - he rushes up and grabs them, again shouting "mine, mine". Poor Minx, she invariably gives up and jumps high up on the couch, out of harm's way.
I have been thinking that this insistence of ownership is the curse of the only child but the more I talk to other parents the more I think it is a developmental stage. I guess it could also have something to do with spending time in daycare where none of the toys belong to anyone and everyone gets acquainted with the concept of sharing on a daily basis. Let's just hope we can get past this stage and all learn to share with grace - even the cat!