lordoflord said: Their relationship? If Shinki made everything in Makai, then Alice is her daughter. There's no interpretation needed.
That would make everything in Makai Shinki's daughter/son/whatever. Which would make everyone in Makai sisters/brothers.
It's best not to think too much about it. 'Cause then you have to consider why Alice was a human instead of a demon like everyone else in Makai, and so many other things that you need to try and explain.