When push comes to shove

Sharing. Lending. Trading. Giving. Whatever you want to call it, they're all the same in this household. A few months ago, Kayla gave this stuffed tiger to Selina and says "This is for you to sleep with! You can have it OK?" Then, the other week it mysteriously disappears from our bed. Last night, after putting them to bed, we hear Kayla crying and Kristin screaming about something so we go investigate. Well apparently Kristin ended up with the tiger, and apparently they 'traded' it with each other. Now trading to me means transfer of goods, a permanent transfer right? Apparently Kayla doesn't think so. To her it means you can take back what you gave/traded at any given time. Selina had to bring up the whole "But you gave it me though!?!?", which further confused things for Kayla. In the end, she won out and got her stuffed tiger, only to wake up this morning looking for another stuffed animal that she probably shared, lent out, traded, or gave to someone. Oy.