K.H.
Hi D. ;)
I have the same problem with my kids, i think that their is a release mechanism in their hands..that just isnt fully developed. And this releases things from their hands at any given moment!!
Anyway...heres a solution..
Get a cardboard box.. Label it Auction Items.
If you find something on the floor and its not supposed to be there..tell them ONE TIME to pick it up.. if it doesnt happen.. this item goes in the auction box. Twice a week you hold an auction for an item of your choice.. You have 3 teens, so this will be fun for you!!
You get to pick the one item to be auctioned.. they dont get to know about it until the minute of the auction. The highest bidder, and they have to have cash, gets the item.. yep for keeps..
You will have some torked teens for a few weeks..but guaranteed..they will start pickin up their stuff.. when you tell them too!!
This advice came from one of my very best friends..and it works..LOL
Its up to you what to do with the other items in the box. The anticipation of them not knowing what item will be auctioned is usually punishment enough..
Good Luck!!