Here is what I remember of it and other details:
- I watched it around 2012-13.
- I am pretty sure it was an anime.
- Had the stereotypical anime tropes(chibi, people getting comically hit into yesteryear, etc.)
- Was a tv show and not a film.
- Took place in a desert, probably near a canyon, at least that episode did.
- I think they were there to visit a relative, but they may have lived there, I doubt it though.
- MCs consisted of a teen boy and girl, pretty sure they were brother and sister. I vaguely remember a toy/plushie being part of the cast.
- Nothing too crazy or magical if I recall correctly, but I think they jump a chasm in their car. That being said, I am pretty sure it was in the fantasy genre, though it might have been either sci-fi or action.
I think it might have been Bleach, but I looked up Bleach and desert and found nothing that I recall from that episode.