(Look at this picture that's up)
If King enma is the father of Lucas. Then who's the mother. I can imagine Lucas mother as Inaho. I don't know who's the mother. But maybe it can be Inaho. Maybe in the Anime.But yokai watch the movie: king enma and the 5 stories nyan! It doesn't talk about it. Maybe in future episodes or a movie we would know. But for now I'll say Inaho or someone we know. Even if the mother is dead. Can this mean that she's also a yokai? Who knows?