For those that might be unfamiliar with the "expanded universe" characters that could be featured in the new Star Wars movies, Chart Geek has put together this handy family tree chart. As you can see it details the lineage of the characters we know and love (well, most of em) from the previous movies in the saga, right up to the sons and daughters of Han and Leia, and Luke and Mara Jade - who are rumored to be the focus of Episode VII and beyond.
Personally I think the new films will definitely focus on the next generation of characters, but I don't think they will necessarily be these exact ones. Expect a lot of changes, and not just the names.