Hello :) SO. Here goes:
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PROLOUGE
"You can't deny it, Narcissa. Not any more. She fell down the stairs and broke her arm, like a muggle child! She should of bounced or SOMETHING."
"She's not even seven yet" she hissed.
"A few days and she will be" replied Lucius "and then what? I'm telling you, time is running out." He continued with a bitter edge to his voice, "all magical children show that they're magic somehow before they are age seven, and EVERY single Malfoy in the last 4 generations showed they were magic before they were three."
Narcissa stayed silent.
"We don't want this kind of shame on our family." He whispered, "What would your sister say?"
Narcissa paused, then nodded, "I understand."
"My daughter, a squib!" he said, putting his head in his hands.
"Don't say that so loud." She snapped. "Draco may hear." The last thing she wanted was her precious son dragged into this.
"What do we do?" said Lucius, despairing. But a moment later, he answered his own question. "She needs to go, we can't keep her. Imagine it, our reputation would be destroyed. We'll give her to some muggle, disown her-"
"But people will talk!"
"People will talk more when she doesn't get her Hogwart's letter" he said curtly.
Narcissa deliberated "we'll have to make an excuse, say she's..."
"Dead." finished Lucius.
Narcissa gasped, "Lucius, she's still our daughter!"
"Is she?" he said, raising an eyebrow. He rolled up his sleeve to display his dark mark. It was pale at the time, but still prominent on his arm. "This is what we signed up for. This is what we stand for Narcissa, and we do not stand for squibs. The Dark Lord may be gone, but on my veins, his mark is still here. And I still believe it. Squibs are Filth. We'll give her away and... and, we will say she's dead."
And for a second Narcissa looked pained, and it appeared as if she was about to say something. But then her face relapsed into it's usual haughty expression, and after a moment all she said was "you're right, I know you're right."