I just bought my two kids an iPad Mini each. These devices only have WiFi. Can these two devices somehow network wirelessly with each other directly, creating a LAN so they can play a game with each other (Minecraft). When at home they can communicate via the household wireless router. However what about when we are away on holiday or travelling in the car? Can the two devices network with each other directly? If this cannot be done, could my wife's new iPad Air (4G) be used as a central router?