To sum up in English:

Yesterday, the remainings of Diego Colón, Cristóbal Colón's brother, were exhumed. The aim is testing his DNA and comparing it to Cristobal's DNA, this way scientists will know which of both graves (Sevilla or Santo Domingo) contains his remainings. They will also know whether Diego and Cristóbal had the same father or Cristóbal was Prince Carlos de Viana's bastard son.
Finally, Marcial castro, director of the project, afirms that these test will determine Cristóbal's origin (Genova or Mallorca).

I heard the idea of Cristóbal Colón being Spanish from two friends with a history degree. They told me that, at university, several teachers supported this theory. It wasn't clear that Colón was from Genova.