Specifically for Minecraft, Realms works for this: I subscribe, I allow my children and friends to access our instance via gamer tag. Users on the same network

Specifically for Minecraft, Realms works for this: I subscribe, I allow my children and friends to access our instance via gamer tag. Users on the same network can access each others' worlds, at least between XBox and Android, so multi-device in the same building works too.