Finch's Landing is also important for what it represents. The fact that the Finch family has some sort of a name or a history is very important in this piece. They are a family that is not from outside, so they should know how to behave, but they don't. Atticus is a bit of a rebel, albeit a quiet one. He is as removed from Finch's landing as he can possibly be and he does not require that Jem and Scout live up to the expectations of "Finch behavior" as is clear when the family visits the landing.
Aunt Alexandra and her husband do live at Finch's Landing and they are representative of an entirely different set of social and, to some degree moral behavior patterns. When Scout and Jem visit there at Christmas this is evident in the interaction that they have with their cousin Francis who is also representative of what can best be described, perhaps, as pretentious and self-centered behavior. The Finches of Finch's Landing put on airs.
When Aunt Alexandra comes to stay with Jem and Scout, as well, the difference in the rules and expectations is evident. Aunt Alexander wants Scout to attend tea, wear proper dresses, and behave like a lady - in other words, to be a proper Finch, but Scout is having none of it.
In this regard, Finch's Landing represents two different belief systems as well - the past and tradition which supported segregation and racial prejudice versus the newly emerging ideologies of the future that are shown not only in Atticus but in Jem and Scout who will presumably carry them on to future generations breaking away from the narrow-minded ideologies that Finch's Landing represents.