The Castro kidnapping story likely varies depending on which Castro is being referred to. If it's in a political context, perhaps it was a move by opposition forces to gain leverage. Maybe it involved abduction from a public place and subsequent negotiations. But again, more information is needed to give a comprehensive account.
I'm not sure as I haven't read it. But common themes in literature include love, friendship, and the search for meaning in life. It could be about any of these.
One possible fanfic could be about Delgado's adventures before he met the main characters in 'Beverly Hills Chihuahua'. Maybe he was on a secret mission in the dog underworld of Beverly Hills, chasing after a group of naughty puppies who were stealing treats from all the fancy dog houses.
Since I don't know the exact story, it's difficult to say for sure. But perhaps family relationships could be a key element, as it's about the Delgado brothers. Time might also be a key factor, which could mean the passing of time affects their story in some way.
I'm not very familiar with 'In Time The Delgado Brothers Story'. It could be a story about the Delgado brothers and their experiences over time. Maybe it involves their family life, their growth, or some adventures they had together.