I know a lot of people in the fandom have thought about a Parent Trap AU, so I thought I'd take a crack at it (sorry, I quote the movie a lot). I'll try and upload a new chapter eat some point every thursday evening (UK time), but I hope you enjoy it, and any comments would be great!

Prologue

October 28th 2016

"You're full of shit, William."

Lizzie spat her words out, and threw her hairdryer in his general direction - no intention to injure; no intention to leave her husband with any doubt over the strength of her emotions. It clearly clipped a finger or two of his hand that had just put down a check book of his from a few years ago. He whipped the hand away with a faint gasp, before shaking off the pain and bounding after his wife, who had swept out into the hallway after the hairdryer had left her grasp. "'My good opinion once lost is lost forever'. Isn't that what you said? You can't forgive William, not unless they turn you on."

He caught up with her at the top of the staircase, and placed a hand on her shoulder. At this she turned around to face him; fighting back the tears.

"Lizzie, what the hell_"

"I should've trusted my first impression of you. I married a slimy, sociopathic robot after all." She turned back around and flew down the stairs. "If you think anybody is somehow less than you, then you do toss them aside, don't you? No thought for their happiness or welfare - just leave them out on their own in the rain." By now her voice had reached a volume she didn't think she was capable of when communicating with him.

"Lizzie, have you completely lost your mind!" He ran ahead and stopped in front of her path towards the entry hall. "Has everything you've ever learnt since we first met been wiped from your memory?"

At this, she stopped. "Oh I remember, William, even if a lot of it was all just hypothetical."

"You can't begrudge me that surely!" His face was now animated in a way only she could bring out, and in this instance, it was through anger. "He deserved it!"

"Oh, so you're talking about the deserving and undeserving poor now, are you?" She reached into the lounge and picked up her phone from the bookcase near the door. "Because you rich people work so much harder than us, don't you?" She yelled with her familiar exaggerated sarcasm.

"Don't make this about class."

"How is it not about class, William?" Her tears started to roll down her cheeks a lot quicker now. "You've been picking out their schools since before we even knew there were two of them, and you haven't even considered a public school, have you?"

"Lizzie, you don't understand anything about what it means to have this_"

"_money? Oh do please tell me about the struggles of the rich. I'm sure I have no idea about what it's like to worry about financial matters."

"There's different responsibilities that you have to think of. You can't just go throwing it about here and there." His voice was loud and curt.

"You know, I'm not so sure that if I pulled off your skin, I wouldn't find your aunt under there saying these words!" She reached down and picked up her handbag by the door.

"Lizzie, what are you doing_"

Her voice was more controlled now. "Like I said before: I do feel sorry for the poor woman who ends up with you for life, because it's not going to be me." At this, William didn't respond, but rather stared at her with his mouth slightly open. The shock and hurt was evident in his face. She hadn't seen it like that since the day four years ago when he'd first confessed his feelings. Lizzie opened the door and was halfway out when she turned back around. "There's enough breast milk in the refrigerator."

Lizzie shut the door behind her. The last William heard of her that day was the sound of her car fading into the distance.