Dear Herma Hermey Hermione,

I hope you're having a good time with your parents. Don't spend the whole time doing your homework though! Things are okay here, except that Harry found this strange mirror. He said it showed him his family, but when I looked at it, I saw something else. He's promised me that he's not going to look at it anymore, but he's been really quiet lately and has spent loads of time staring out of windows and he's been having nite nightmares too. I don't know what you can do, but if you have any advice, that'd be great.

From Ron.

P.S. Happy Christmas!

Hermione scrambled through the portrait hole. Two weeks away from school and she'd forgotten how inconvenient the entrance to her home away from home was. It wasn't made any easier by the large bundle she was carrying.

Smoothing down her robes (urgh, she was already missing trousers) she looked around the Common Room until she saw Harry and Ron playing chess by the window.

"Hey, guys," she said, rushing over to them.

"Hermione!" They both cried, standing up. Hermione internally rolled her eyes. Boys. She had run into Lavender downstairs, who had hugged her straight away, but Harry and Ron, who she was much closer to, just stood there like lemons.

They exchanged pleasantries for a few moments before Ron's curiosity got the better of him.

"What's that you're carrying, Hermione?"

Hermione dropped the bundle on the table and revealed that it contained a present wrapped in glossy, red wrapping paper.

"It's for you, Harry," she said.

"But you already got me Chocolate Frogs," Harry said in confusion.

"Yeah, how come Harry gets two presents," Ron complained.

"Shush you," said Hermione. "Go on, open it," she prompted Harry.

A moment of tearing paper later and Harry had a book in front of him.

"Spearman's Collection of British Wizarding… Ge…"

"Genealogy," Hermione corrected Harry. "With a soft 'G'. It means ancestry and stuff like that."

"Okay, thanks, Hermione. Is this about Flamel?"

"No," Hermione said and then she paused, visibly nervous. "Ron wrote to me about your run in with some kind of mirror."

Harry looked at Ron with betrayal in his eyes.

"Don't look at me like that," Ron protested. "That mirror messed with your head."

Harry frowned, but didn't disagree with him.

"Okay, so how does this book help?" Harry asked.

"Look," Hermione said, opening the book to a marked page. "Here are the Potters."

Harry stared at the page with wide eyes, his fingers touching his parents' names.

"Hermione… I…"

"There's more," she said. "Here, your father's mother's mother, her maiden name was Black.

Ron made a noise, and when the others looked at him, he said, "not a family with the best reputation," he said. "But I'm sure that Harry's…uh, great-grandmother was lovely," he added quickly.

"Anyway," Hermione continued. "If we turn to the Blacks," she flipped through the book. "We can see that your great-grandmother's sister married a man called Andrew Prewitt."

Ron coughed and sputtered for a moment.

"And if we look at their descendents, you'll find their grandchild Molly Prewitt, who married an Arthur Weasley, who then had seven children, including…"

"Ron?" Harry asked, his eyes wide.

"I hope you enjoyed your Chocolate Frogs, Harry," Hermione said. "But I thought you might also like to be introduced to your third-cousin, Ronald Weasley."

Harry was silent for a long moment, looking between his two friends and the book in front of him.

Ron laughed and clapped Harry on the shoulder.

"There you go, cousin. You didn't even need to go looking for your family, it's right here."

Harry looked at Ron, still dumbfounded.

"Hey, Fred, George, Percy!" Ron called. "Come and see what Hermione found."

"There are a few other third-cousins," Hermione said, pulling a list written on Muggle stationary from the back page of the book. "A couple of those in the Quidditch team, some Hufflepuffs. I don't know how many cousins back you have to go for it to hardly count, but you're related, at least slightly, to all the pure-bloods in the country."

While Ron explained Hermione's discovery to his brothers and Harry received more claps on the back from the twins and a handshake from Percy, Harry looked at Hermione, with tears of joy in his eyes, and mouthed 'thank you'.

Harry wore his Christmas Weasley jumper for as long as he could before the weather got too warm.

"I'm related to Malfoy?!"

"You told Harry what?!" Ginny wailed.

I don't know how canonical the extended family trees used in fanon are, but Harry should be related to the Weasleys somehow.