The mother really died.
- There's another way of looking at the film. If the mother dies (during childbirth) at the beginning of the film and the myths of the picture are just metaphors and non-literal, then the whole thing is just a symbolic journey of a kid with the loss and absence of his mother which they eventually come to term with.
Consuelo (the mother) is a Walking Spoiler.
- What she might do in the movie is so impactful that mentioning her presence is a spoiler. It could explain why she was barely mentioned in the movie's trailer.
The sídhe adopt A Form You Are Comfortable With.
- To explain why they resemble humans Nahuel and Antonio know.