Forum:KB:The Old Republic Novel Creates New Conflict

So upon reading SWTOR Legends Deceived, I came across a somewhat important bit of a conflict. In the last part of the book is a non traditional, short type of biography on some of the main characters. It states that "Han eventually married Princess Leia, and together they had three children--the twins, Jacen and Jaina, and their younger brother Anakin." I thought to myself, why is Ben not one of their children? After I pondered this for awhile, I continued on to read Luke's Biography and this part startled me a considerable amount. It quoted "Together (Luke and Mara Jade), they had a son, Ben." Now this come across to me as being very strange after watching TFA. What are you thoughts or if someone could clarify this would be great!