The Better Offer by Anne-Li: https://archiveofourown.org/works/126582 Victoria Red, Dorian's sister, is at a ball, when she see a man slap her brother's face - and she gets very interested in this Major Klaus von dem Eberbach.

Scrapbook by Telwoman: https://archiveofourown.org/works/13076232 The Dowager Countess of Gloria is visited by her great grand-daughter. They pass the time with a few glimpses into the Dowager Countess’ past.

Postcards from Paris by Cassie Ingaben: https://archiveofourown.org/works/42286 Scenes from the life of Dorian. One vignette every 5 years, starting from when Dorian was five.

Not the Most Terrible Thing by rsadelle: https://archiveofourown.org/works/10081469 Dorian's mother meets Klaus's father, and they try to pair Klaus up with Dorian's unmarried sister.

Family Matters by Margaret Price: http://www.fried-potatoes.com/fanfiction/viewstory.php?sid=153 Dorian introduces Klaus to some of the skeletons in the family closet

Regrets by Cecily Reindhart: https://www.fanfiction.net/s/4096158/1/Regrets Thoughts of Dorian's mother at the end of her life.