it would be vey important to know the exact place where they lived in Sicily. Failla is a common surname both of Palermo and of Siracusa (have a click on the italian http://gens.labo.net
to see the distribution of italian surnames). Anyway we'll check among our sicilian relatives and keep you posted.
We don't live in Sicily, but in the North of Italy. After 20 years we found out that close Failla relatives were living in the same town!
Giorgia and Francesco