Prizzi's Family is a novel by Richard Condon published in 1986. It is the second of four novels featuring the Prizzis, a powerful family of Mafiosi in New York City. In all four novels the main protagonist is a top member of the family named Charlie Partanna.
Mardell La Tour is actually Grace Willand Crowell, daughter of an Assistant Sec. of State for East Asian and Pacific Affairs, an immensely wealthy family that lives in a Federalist House in Georgetown.
Vincent Prizzi, son of Don and Boss: Vincent conspired with his own ignorance. He was a perpetually baffled man who chewed on pieces of himself and then spat them out at the world.
While making love: "It was like being locked in a mailbag with eleven boa constrictors." page 68
"The way he did this was whisper into Vincent's ear in Sicilian, then Vincent spoke it into the microphone in Brooklynese, dumping the words out of the depths of his stomach the way a piled wheelbarrow is emptied by upending it." page 59
- New York Times review October 29, 1986, Section C, Page 24
Not a review, but an interview with Condon: https://www.nytimes.com/1986/10/29/books/condon-s-prizzis-turn-into-a-series.html?searchResultPosition=1
Sept. 28, 1986, Section 7, Page 13 of the National edition with the headline: CHARLEY AND MAEROSE: THE EARLY YEARS.