How do you know framton has never met the sappletons?

Framton Nuttel's unfamiliarity with the SAppletons is evident in his nervous demeanor and the way he interacts with them. He awkwardly introduces himself, suggesting he is a stranger to the family. Additionally, he is unaware of the tragic story regarding the missing men, which reflects his lack of prior knowledge about the SAppletons and their history. His surprise and confusion during the conversation further indicate that he has never met them before.