Good luck getting your money/property back
What happens if the police don't respond? You discover them at the beginning of a long holiday weekend? It's a second residence and you discover them as you open the door to let your family stay there?
The mental gymnastics people will go through to try to justify someone breaking & entering and trespassing on someone else's private property is insane. They are criminals and should be treated as such, regardless of when you find them, regardless of whether you report it immediately or take a few days to try to reason with them or not.
They are definitely delinquents, but calling that a crime is a stretch, no lives are at risks.
Of course not since it's a city in a different country with different laws.
If that was the primary residence of the family, it wouldn't be considered a "occupation" as discussed in this submission, but rather "breaking and entering" ("allanamiento de morada", or similar), and police should definitely get them out ASAP, anything else is a disgrace.
But again, has nothing to do with okupas because it wouldn't be considered an occupation in the first place.
Try go to the local news, because if the police does nothing about this, I'm 100% sure the news are interested in this story.
Guess the difference is that in Spain if you detect them within 48 hours of them entering the property, you can "easily" and legally remove them with the help of the courts and police.
But once you're beyond those 48 hours, things get a lot harder.
2) Now the law changed and it is much easier and faster to kick them out. It was always illegal to squat, now sanction are higher
3) Most squatters are not targeting houses. And all the time squats are mainly building not used for years (as it safer and easier for squatters, and sometimes as a way to "minimize" disturbances)
Please note that in Holland some kind of squat were legals for years (only for building not used for years and with obligation to not damage the property and to give it back quickly). Seems interesting to me