If I begin to read a book that is part of a series, I have to read all of them. That being said, I will wait until the third and final book of this Century Trilogy series is published next year. Then I will read all three books, especially since each subsequent book continues the families' stories.
If you like this type of historical novel, may I suggest the novels of Edward Rutherfurd? His books encompass centuries in the history of cities/countries, following several families whose lives intertwine through the years.
Here is a link to a great source of information about authors/books/genres, etc.