Not really. The Newlins were actually only in one or two chapters of Book 2 and that was just when Sookie was locked in the basement of the Fellowship. Their characters were made massively bigger parts on the show. Jason had nothing to do with them or Dallas in the books. There's not any more of Sarah Newlin in another book (that I remember), but Steve and another nameless Fellowship member make a very brief appearance in one chapter of Book 3. The fellowship as whole is mentioned sometimes in book 7, but they aren't actually "seen". I don't really know how to explain that without giving away a certain plot point from that book. None of that necessarily means anything though because the show doesn't follow the books that closely and they change things all the time so there is always a possibility that they could come back on the show in a bigger way than they do in the books.