https://www.starwars.com/news/star-w...RnoL_QhOM5SbPE
The original EU version of Han and Leia's marriage happened in the old "Jedi Prince" YA adult series, which oddly enough, dealt with Palpatine's son and grandson, but it was later overridden by the Courtship of Princess Leia novel, which took place a year before the Thrawn trilogy and notably added the Witches of Dathomir to Star Wars lore, which is still in the Disney canon (Although with some tweaks). Now it looks like a third, Disney version is coming out, although of course with a tie-in to Disney's new hotel.