Is Mario Bosh/Bossi Triela's real father?
As the background story on the wiki states (I believe this part is handle further on in the manga so do consider this a spoiler) 


  Originally from Tunisia, Triela was kidnapped and smuggled to Amsterdam by the Mafia, where she was drugged, tortured, and sexually assaulted during the routine taping of a snuff film. Victor Hartmann and Rachelle Belleut, acting on a lead from guilt-racked Camorra mafioso Mario Bossi, stormed the warehouse where she was being held captive and subsequently rescued her, just as she was succumbing to her injuries and to cardiac arrest.