Welcome to the third installment in the Simple Chemistry Series. As usual, I don't own anything. You don't need to read the other stories to follow this one, but I'd love it if you read them anyway. Thank you to everyone for all of your support and encouragement.

"entropy. (S)

Entropy is a measure of energy dispersal. Any spontaneous change disperses energy and increases entropy overall. For example, when water evaporates, the internal energy of the water is dispersed with the water vapor produced, corresponding to an increase in entropy."

Chapter 1

The first rays of dawn were creeping into the room when Seeley Booth was jolted into consciousness by a sudden weight crashing down on his chest, effectively knocking the wind out of him. He groaned and threw a pillow over his head, causing the mass on his chest to giggle. "Daddy!" Park shrieked, his small form quivering in excitement. "Is it time to go to Disney yet?" His caramel colored eyes shone brightly as he gazed eagerly at his father.

"Disney isn't for two more days, bub", came the muffled reply came from beneath the pillow.

"Awww…I had a dream that I went to Disney and met Dumbo and Mickey and Tarzan! Then, we all went and rode all the fastest rides! And Buzz Lightyear was there too! We ate ice cream and pizza and had so much fun! So when I woke up, I thought it was time to go…" Parker pouted.

"Sunday will be here before you know it, and then we'll be on our way to Disney for a whole week." It had been three months since the shooting and Booth was finally fulfilling his promise to Parker, a trip to Walt Disney World. Rebecca was not initially thrilled with the idea, but even she could not resist Booth's charming smile. Cullen was also not happy about losing his best agent for any length of time, but seeing as Booth hadn't been on vacation in two years, he was well overdue for a break. At hearing the news, Parker had been excited to say the least; and had been asking his father everyday since the news broke if it was time to go yet. After what seemed like an eternity to Parker, summer vacation was here and they would be leaving in two days for Florida.

While it was currently only 5:30 am, Booth accepted that there was no way Parker was going back to sleep, so he may as well get up. He gently displaced his son onto the mattress as he slid out of bed. He began his morning exercises to help wake himself up.

"Hey Daddy?" Parker continued to bounce on the bed, his messy blonde curls flopping up and down.

"What is it, bub?"

"Can Bones come with us to Disney World?" Booth stopped mid-crunch to stare at the boy; seeing the confused look upon his father's face, Parker continued, "It's supposed to be the happiest place in the world, right? Well, you said that Bones has been kind of sad lately because her friend went away. I think she should come to Disney with us so then she'll be happy again!" He exclaimed, excitement coursing through his small body.

"I don't think Bones would really enjoy going to Disney. Besides, we're leaving in two days. I don't think that would give her much time to get ready and buy a plane ticket." Booth shook his head, noting the dejected look on the fair-haired boy's face. He felt torn; part of him wanted Bones to come as well, to spend some quality time with the two most important people in his life, but he knew there was a snowball's chance in Hell that she would agree to go.

"You absolutely sure about this? I thought you wanted it to be just me and you."

"I'm very very very sure! Please Daddy?"

"Okay, but I can't guarantee that she'll go, buddy. So you gotta promise that you won't get too upset if she says no."

"I promise, but she won't say no."

"What makes you so sure?"

"I just know."

"Okay, smart guy," Booth said, glancing at the clock, "but let's let her sleep for a little while before we call, okay? Now let's go get some breakfast." Parker nodded vigorously and practically dragged his father out of the room towards the kitchen.

Just after 7am, Temperance Brennan was sitting at her desk examining a radiating skull fracture when her cell phone shrilled loudly. Glancing at the screen, she sighed heavily and pushed the 'talk' button. "Booth, I already told you that I'm too busy to go to the diner today."

"Bones?" Brennan froze, caught off guard by a dramatically different voice. She paused momentarily before continuing. "Who is this?"

"It's Parker." Although Booth could only hear half the conversation he could picture the confused look on his partner's face; he began chuckling quiety. "I just wanted to ask you a question, and Daddy said it was okay to call you." Parker gripped his father's cell phone tightly with both hands, looking very serious for a six year old.

"Of course, Parker. You can ask me anything."

"Will you go to Disney with me and Daddy?" She wasn't expecting that. She stumbled for a moment, trying to process the request.

"I…well…"

"Please Bones? Daddy said that you've been kind of sad lately, and that's no fun!"

"Yeah, please Bones?" Booth chimed in, grinning as he imagined the shocked look on her face.

"Did your father put you up to this?" It would not have been the first time; she had trouble saying 'no' to the little boy, and her partner exploited this weakness mercilessly. However, this was crossing the line.

"Parker came up with this idea all on his own, I swear."

"I thought it was supposed to be a family vacation for the two of you."

"I know, but I want you to come! Pretty please! I promise I won't ask for anything else ever ever ever again" pleaded the younger Booth.

"I just don't think it's a good idea. I have a lot of work to do, and it really should be a family vacation." Parker's face fell at this last statement. Booth leaned over and whispered something in his ear.

"There is more than one kind of family, Bones."

"Yes…but-"

"Bones, you have thirty seconds to come up with another lame excuse." Booth inserted.

"My excuses aren't lame."

"So you admit that you're just making excuses."

"I…well…"

"Thirty…twenty nine…twenty eight…" He started counting down, causing the anthropologist to become more and more flustered.

"Remember the tree!" Parker shouted. There was silence for a moment before Brennan finally spoke again.

"Okay, I'll go, but-"

Parker began cheering loudly, causing Brennan to hold the phone away from her ear so as to preserve her hearing, and drowning out any possible objections she could have had. Though a little surprised that she actually agreed to go, Booth couldn't help but smile; the trip was looking better and better by the minute. He made a mental note to ask Parker later about what he meant by 'remember the tree'. "You're the best, Bones. I'll e-mail you with all of the flight plans and stuff like that. See ya Sunday!" He chimed in, taking the phone from Parker, shutting it, and tossing it across the room. He turned to his son and gave him the biggest bear hug possible; Parker shrieked and attempted to wriggle out of his grasp. The two wrestled on the best for several minutes, before collapsing in a heap, energy spent. Across town, a very perplexed anthropologist stared at her now quiet mobile device, wondering exactly what she had just gotten herself into.