Hi I'm a distant relative of Shawn Shaw and we share the same great grandfather Vincenzo Nicola Varalla, not Varallo this seems to have been a corruption when he emigrated to the UK. There aren't any Varallos in Viggiano, so I guess your grandfather was also a Varalla if he came from Viggiano. I have been doggedly going through all of the Civil Records for Viggiano, and recorded all the Varallas, so if you let me know his name and approximately when he was born I'll have a look and see if I have got anything on him.