I had a crazy week at work, and unfortunately I wasn't able to came up with anything longer. Enjoy!
Once upon a time, there was a very powerful and ambitious wizard, who more than anything seeks power. He gathered a group of people who wanted to follow him. One of Hogwarts principals would describe them as a mixture of the weak seeking protection, the ambitious seeking glory or the thuggish seeking a leader. But he was wrong. The first crew of the Death Eaters was much more than that. They wanted to be better in Dark Arts and they wanted to know that there is more in the world. They were better than everyone else, that's a simple fact. In this world, there is a simple selection for those who should be alive, and those who shouldn't.
Every single one of the Death Eaters wanted to please the Dark Lord. That wasn't an easy task, He-Who-Must-Not-Be-Named was a tough person who demanded complete obedience. The Dark Lord didn't have His own house. He refused to took the place with belongs to his muggle father so He decided that his followers could evidence their subordination. When He settled in a new location He bothered all: the appliances, the service and finally the people. There was not very well known but the Dark Lord has His own ritual. After each satisfied kill, He was very excited and He needed something to release a tension. Usually, that was someone, a woman. He usually picked one of available female Death Eaters and honored her with a visit in His bed. Short visit.
There were two female Death Eaters who boasted that the Dark Lord let them visit His chambers more than others. Bellatrix Lestrange and Vanessa O'Shea hated each other, but they both cared deeply about the Dark Lord. One night Vanessa just disappeared. Nobody knew where or why she was just gone.
The reason why is trivial. The Dark Lord more than anything hated attachments. He seeks to be glorified and respected and even more, he wanted people to be scared of him. That's mean no weaknesses. Vanessa knew it very well. That's why the moment she discovered her pregnancy she flew away. She had twins: a boy, Tomas, and a girl, Amelia. Both knew about their father since the very beginning, who He was and what had He done.
Vanessa stayed loyal to His idea until her tragic death in 1992 during her trials to defeat a dragon. Neither Tomas nor Amelia wanted to follow her path. They had cut all the links between them and their mother's live in the UK.
During their time in Ilvermorny, they met Jennifer Potter and later all of her family. They were discovered by a former headhunter for one of New York's recording company and they formatted a band. The name was obvious. If they cannot stay cutter from their past, let make Him pay. Let make His name a model for Muggles. And that is how The Riddles was born.
Amelia is a calm and balanced girl. She looks very much like her mother with short brown hair and blue eyes. She was never considered a classic beauty, because of her sleigh overweight and freckles. Tomas, on the other hand, was a dead ringer for his father a long time ago. He is handsome and athletic and if you knew Lord Voldemort in his twenties you wouldn't notice any difference.
Vanessa stayed loyal to Lord Voldemort till the very end. Their children wanted him gone once and for all for not being able to love them.
Or that was the reason they provide.