Leah loves blue, Eve likes pink, purple and yellow. You wouldn’t think there would be much to argue about with that, except now they have decided that colour choices are like personalised number plates and once you’ve nabbed one it’s gone forever. If Eve so much as hints that she might quite like something in blue, Leah is convinced this is personal theft as she has claimed the rights for all blue objects in the world for evermore. So whilst their arguing over inconsequential pieces of plastic tat was bad, at least you could see and confiscate the plastic tat. Refereeing squabbles over concepts is a whole new territory which I suspect is going to cover a lifetime of sibling rivalry.