Sometimes, there are just plain good people in the world. Martino is older. Maybe, finally, someone was just treating Daniel like a son and he was someone that Daniel trusted.
I wasn't meaning anything derogatory about Martino. I'm thinking Anna or Howard set up this living arrangement so Martino could keep an eye on Daniel (good intentions on Martinos part). If Howard had anything to do with it, which he usually does, then there are other questions.