Marriages may come and go, but parenthood is forever. But what if you could have both—a great family life, and a happy lifetime love? The fact is, you can—by relying on what’s known about relationships all around the world. Dr. Terri talks to Dr. Duana Welch, author of the new book, "Love Factually For Single Parents [& Those Dating Them]," the first guide that relies on science to help this large and growing group of men and women find the right partner not only for themselves, but their families.