DD1 and DD2 have shared forever, with DD3 and DS having their own rooms. DD1 has now decided after a lengthy five minute spat with her sister that she never wants to sleep in the same room as her again, and is demanding she gets DD3's room, who will move in with DD2 in her place, and until this aim has been acheived she is apparently going to sleep on the landing in her sleeping bag
. DD2 refuses point blank to share with DD3 (who obvs isn't going to move out of her room anyway) and has declared their room now solely hers and will not let DD2 move back from her landing. DH of course, finds it all hilarious, but I have no clue on how to get them to co-operate and just stay put for heaven's sake