This may throw some light on it....
Property Laws of a Toddler
If I like it, It's MINE
If it's in my hand, it's MINE
If I can take it from you, it's MINE
If I had it a little while ago, it's MINE
If it's MINE, it must never appear to be yours in any way
If I am playing with or building something, all the pieces are MINE
If is looks like MINE, it's MINE
If I saw it first, it's MINE
If you're playing with something and you put it down, it automatically becomes MINE
If it's broken, it's YOURS