A/N: I don't own the Harry Potter universe, JK Rowling does.
I'm not a native speaker and don't have a beta, so there are some mistakes; I hope not too many.
I made up a little Sister for Draco. I named her Hydra Patricia. Hydra is a constellation that represents a water snake; the name Patricia is of Latin origin meaning "noble" or "patrician", which means to be highly ranked in the society of the Romans. Her birthday is on 14.08.1981, so she is about one year younger than Draco (birthday 05.06.1980), so she will come to Hogwarts together with Ginny.
Little Hyrda was excited. She was going to Diagon Alley for the first time. Her father had some business to do and her mother would take her and her older brother Draco shopping for clothes. She really couldn't wait to see this street. Her brother had teased her for some time now that he had already been in Diagon Alley and she was still too young to go. Well that would finally change today. And so Hydra climbed into the fireplace, holding her bunny Babbitty in the one and her mother's hand in the other hand and seconds later they were in the Leaky Cauldron, where they would meet one of her mother's many friends and their children. The place looked kind of shabby to Hydra, not at all like her home where all was clean and shiny. And there were people who wear clothes her mother wouldn't even allow the elves to clean with. "So this was Diagon Alley." thought Hydra and couldn't understand all the fuss about it. "Why would everyone want to go shopping in such a place?" Hydra was pulled out of here thoughts when two men started to shout at each other and pulled out their wands. Soon others came to help to one of the brawlers and nearly everybody was on their feet now. In all this turmoil Hydra had to let go of her mother's hand and was frantically searching for her now, when a door opened. A man came into the pub and Hydra could see the street behind for the first time. There where people walking by and metallic boxes with people inside Hydra had never seen before rolling around. "This must be Diagon Alley. I will go and wait there for mother and Draco." thought Hydra and entered the Muggle World for the first time. She was in the street some time now and still her mother and brother hadn't shown up. Tears were beginning to run down her face and she was running along the street calling for her mother, when a man in a uniform stopped her.
"May I help you little Lady? I'm Officer Davis."
"I lost my mother and brother and can't find them."
"I'm sure they are already looking for you. Can you tell me your name?"
"I'm Hydra, Hydra Patricia Malfoy. Do you know my parents? They know a lot of people."
"I'm sorry young Miss Malfoy. I don't know your parents. But I will take you to the police office just a two minute walk away. Your parents will sure be looking for you there."
"What is the police?"
"The police are there for people when they need help, like you when they are lost."
"Like the aurors?"
"Emm, sure."
Officer Davis had a long day. There was this girl he had found in the streets five hours ago and still her parents hadn't shown up to report her missing. Nowhere in the entire city was somebody missing a little blonde four year old girl. And he and his colleague couldn't find one family in the entire city register with the name Malfoy. Her colleague, who was fascinated with the royal family, had told her that in the late 17th century there was a Lord Malfoy, who was an unsuccessful aspirant to the hand of Elizabeth I, but after that the family had disappeared and nobody in Britain had had this name for nearly 300 years now. But still there was this little girl sitting in his office with her rabbit asking for her mother. If they don't show up soon, he has to call social service to arrange a foster family for the young girl until her parents are found.
Meanwhile in the Leaky Cauldron the turmoil was over and Narcissa was searching for Hydra, but the girl was nowhere to be found in the entire pub. Eventually her friend Celestina Parkinson had taken Draco and her two girls Pansy and Pippa to her manor and she had called the aurors. Now she sat in the auror office. Lucius had arrived a few minute ago.
"Mister and Misses Malfoy, we assure you the Auror Office will do everything in its power to bring back your daughter. We assume that with your social status and wealth, that whoever took your daughter holds her to get ransom money from you. Are there people you are out of sorts with?"
"This could be a long day." Narcissa thought. "Honestly, you can't be high in the Dark Lord's ranks, escape Azkaban and run a successful business without making a few enimies." Her husband has already begun to name names.
"Has an owl with a ransom demand already reached you?"
"No."
"We will have an Auror accompany you home to cast some tracking spells on it, when it arrives."
And so Narcissa went home without her daughter, praying that she would return safe and waiting for an owl that would never come.
Of course Hydra's disappearance made the Headline in the Daily Prophet the next day: "Malfoy daughter abducted"
… two weeks later …
"Still no sign of Hydra Malfoy"
… another two weeks later …
" Malfoys offer 500.000 Galleon reward for hints, which lead to the abductor of their daughter"
At the same time in Muggle London, John and Julia Miller enter an orphanage to pick up their foster child. Mrs. Jones, the matron of the orphanage, welcomes them and invites them into her office to talk about their foster child.
"Her name is Hydra Patricia Malfoy. We call her Patricia or Patty for short. Who in his right mind would give a daughter the name of a snake?"
"So, Patty then. When is the girl's birthday?"
"We don't know that for sure. She is too young to tell, but when she was found she said she turned four last week, so they put August 16th 1981 in the papers."
"Is there anything we should know about her?"
"She is quite an imaginative child, who likes to tell stories. According to her, her parents are magical. They have wands and can do all sort of tricks. The paintings in her home could talk. She also told us that there is something like a chimney network for transportation, you put some powder into the flames, tell where you want to go and a second later you are there. She even insisted that it is completely true. As I said she is an imaginative child."
"We understand that as her foster parents, she could be taken from us at any time."
"That is correct, the police are still trying to find the girl's family, but as far I have been told the family name wasn't used in Britain for about 300 years. When she is still with you in two years you can start the adoption procedure."
And so two years later Hydra Patricia Malfoy became Patricia Miller.
A/N: I have no idea of how the adoption process in the UK is working, so I made up this two years rule. The next chapter will be Patty's arrival at Hogwarts.
