Final answer:
The provided texts do not explicitly reveal the nature of the Dei Santis family's business. Harriet's spying activities are mentioned, but without further context, the family's business remains unspecified.
Step-by-step explanation:
The Dei Santis family, which comes under Harriet's spies, doesn't have a specified business mentioned in the provided text excerpts. These passages do not contain direct information regarding the Dei Santis family's business or profession. Harriet's surveillance and gatherings imply a level of intrigue and perhaps clandestine activities, but the nature of the family's business is not detailed in the provided text.
It's possible the Dei Santis family plays a part in a larger narrative that might reveal their business, but with the given excerpts, we are unable to determine what sort of business they run. The provided texts center on different characters engaging in secretive behaviors or being discussed within social circles, indicating that spying and social reputation are recurring themes across these narratives.