I bought and downloaded the app onto my home computer, my iPhone, my daughter's iPhone and our iPads using these same iCloud account. She creates her world and builds whatever it is that she builds. Then her brothers go in and destroy or delete her world. Is there a way to prevent them from accessing her world? Would it help if a create an iTunes account for her and download it to her phone? Would her brothers be able to access her world if that happens. Please advice.