What is the purpose of Matilda Layamon's marriage to Benn Crader in the novel, More Die of Heartbreak?

Over the course of the novel, we learn that the Layamon family's real motivation for making the match between their daughter and Crader is greed. Years earlier, Benn's uncle Harold Vilitzer, a mafia-style chieftain and political figure, had cheated Benn's family out of some real estate holdings that are now worth fifteen million dollars. The Layamons want to use Benn to attack Uncle Harold and get the money for themselves.