SD12 has always been the type who wants everything she sees.  The novelty tends to wear off very quickly and within a short period of time she no longer gives a hoot about said item.  This has been going on ever since she was a toddler.  She lives with her mom and we see her every second weekend.  This weeks coveted item is a stick.  Yes, a piece of wood.  DS9 and myself went for a walk earlier in the week and he found a lovely stick lying on the ground under a tree.  He took it along on the walk...it was the perfect height for a walking stick.  He peeled off the bark, and wanted to take it home.  Once getting it home, dad helped him sand it down and DS painted it.  So today SD12 comes over and immediately sees the stick.  "What's that?  Where did it come from? What park did you find it at?" Later this evening we went for a walk and the entire time she's walking off the trail trying to break sticks off healthy trees.  DH tells her to give it up numerous times.  Then for the duration of the trip she's just randomly repeating "stick!"  Like, seriously...you want a god damn stick.  She is like this with everything.  Every single item DS has that she doesn't have, she wants it!  It could be something she has never shown any interest in before....but because he has it and she doesn't...she immediately wants it.  She comes to our house with a bag full of random crap every time she's here.  DS couldn't give one care about her stuff.  How do you handle this kind of behaviour?  I just want to tell her "you don't need to have everything you see!"