Sandiago was the nephew of Don Fanucci.
Biography
As Fanucci's nephew, Sandiago was known as something of an untouchable around the Hell's Kitchen neighbourhood. He was however, not involved in the business of his uncle, and opted for a respectable job.
He did, however, utilise his uncle's connections to gain himself a job at Abbandando Grosseria, removing Vito Corleone from his post. Sandiago remained here until the death of Signor Abbandando.