I think my family is sort of out on our own limb. My grand-big went alum b/c she married, and my great grand-big was gone before I joined A-Phi. I have recently been thinking about getting a family tree going for my family.
When my chapter was founded a little over 5 years ago, there were 5 families (with a few girls per family), each with a different family name. Now, I want to say that 1 or 2 families have already died. My family name is the most popular family. All the girls who have my family name and are not in my "immediate family" are considered, aunts, cousins, etc, because we know that somewhere down the line we are related.
All this family stuff is really cool!