Finally, I'm back with another chapter. It feels like it's been too long. Either way, the end of this story is finally here. As long as I say that I don't own Phineas and Ferb. So, I don't own Phineas and Ferb. Oh, and has anyone else noticed that Oliver Clark's initials are OC? It's a complete coincidence, I swear. At any rate, enjoy the chapter.

Later that afternoon, two cars pulled up into the driveways of their respective houses, across the street from each other. It would be ironic, then, to know that the two cars had come from the same place, at the same time, and shared the same family in between them, yet pulled into the driveways of two different houses from opposite ends of the road.

Contrary to what you may think, though, it was the first part of that sentence that was ironic. For years, the people in the two cars had lived across the street from each other, not knowing they were related. It wasn't until earlier that morning that they discovered such information. It was then that the two families, separate then, each decided to take a trip to the local cemetery, where the father of the children in both families was supposed to be buried. Was it fate, then, or just an unfortunate coincidence, that the said father of all three children was the same man? To the Flynn-Fletcher and Garcia-Shapiro families, that was the question of the day.

Isabella, as it turns out, has the same biological father as Phineas and Candace, and the two families were only beginning to discover what effects it would have.
Without a doubt, the biggest burden fell to Isabella. She had a crush on the boy across the street - Phineas - for as long as she could remember. But that boy across the street is now that brother across the street. Isabella had a crush on her brother. And she didn't know it until this morning. If that wasn't awkward, I don't know what is.

For that matter, Phineas was having his own problems getting his head around such information. Okay, so as far as we know, he doesn't have a crush on Isabella. That girl, however, has been his best friend for years. That girl was simply the girl across the street. And, though Isabella was wishing that people could say otherwise, Phineas saw her as simply that. The best friend across the street. He wasn't sure he could change best friend to half-sister.

Candace, although shocked at such revelations, didn't have many roadblocks to overcome when she found that out. Really, it was just getting over the fact that Isabella can no longer marry Phineas - she had secretly been obsessing over that possible relationship, even planning a wedding between the two in a corner of her closet. Candace was absolutely certain that Isabella would be her sister one day. She just never guessed that it would happen like this. And the official title, of course, is half-sister, as opposed to sister in-law. Not what she expected.

"Okay, kids," Mrs. Flynn-Fletcher said, getting out of the car. "Vivian and I were talking about how this was going to change the way we live, and we reached some decisions."

"First," Mrs. Garcia-Shapiro began. "And probably most relevant to you, where to live? Linda and I agreed that since you're all related, you should be able to live where you please. So, technically speaking, both my house and her house are now your home. We will prepare an extra bedroom, or bedrooms, in my case, for you. Feel free to eat and sleep in either house at your leisure."

"Second," it was Mrs. Flynn-Fletcher speaking up now, "everyone else ought to know what we found out today. So, I'm going to leave that to you three, while Vivian and I figure out how else to deal with this."

"Yes... mom?" Isabella asked, hesitant. Was that really Mrs. Flynn-Fletcher's new title, given the situation?

Linda laughed. "I was wondering that, too. Now run along, children."

The first thing Candace did was run off in the direction of Jeremy's house, leaving Phineas and Isabella behind to break the news to everyone else.

"So, who should we tell first?" Isabella asked.

"I'm thinking Ferb," Phineas replied. "After all, he's related to you too, now."

"Is he?" Isabella asked. "Neither of our biological parents, nor our parents now, are the same."

All of a sudden, Phineas' face became a lot more stern.

"Don't get any ideas," he said, waving a finger accusingly at Isabella. "If you even think about getting with my brother..."
Yes, despite all obliviousness to romantic gestures involving him, Phineas was quick to sense such tension between others. And, let's face it, he didn't want his sister marrying his brother, even if the two weren't actually related.

Isabella laughed. "Why would I do anything like that? Ferb is as much of a brother to me as you are."

"That's what I'm worried about," replied Phineas, but he couldn't stay serious forever. It quickly became evident to Isabella that the boy was only joking, even if he was serious about his objections to... any relationship between the two.

Laughing, Phineas took Isabella's hand, and walked inside.

"Hey Ferb! Guess what?" Phineas called, walking into their bedroom, Isabella right behind him. It must have been the cemetery that kept him from being his cheery, optimistic self. He was adjusting to this new life rather quickly and naturally.

Ferb was sitting at the desk, working on blueprints of some sort. He got up and turned around to greet his brother, and was surprised to find Isabella there as well, holding Phineas' hand.

"You two finally-" began the Brit, motioning to their interlocked hands. It wasn't unusual to see his brother holding hands with Isabella, but it always took some special encouragement.

"Got together?" Phineas finished Ferb's sentence for him. "Yes. Yes we did."

In an instant, Ferb's view changed from Phineas and Isabella's hands to Phineas' face.

"Yeah," Phineas said, before Ferb would have to speak. "I didn't see it coming, either. Mom took us to see the grave of my real dad, and it turns out that he's Isabella's dad as well. So we're half-siblings."

Now that, Ferb didn't see coming. He turned to look at Isabella.

"Yeah," the Fireside Girl agreed. "Weird, isn't it?"

All Ferb could manage to do was nod.

Phineas woke up the next morning from the strangest day, and night, of his life.
He still couldn't get over the fact that Isabella was his sister. Not that it was a bad thing. Phineas couldn't decide whether or not it was. It was just so... unexpected.

He decided to spend the night in his new bedroom in Isabella's house - you know, just to see what it would be like. Isabella had reached the same conclusion - and as a result slept in what was the guest bedroom of the Flynn-Fletcher residence, but was now her bedroom.

Walking downstairs, he bid a good morning to his Aunt Vivian (for that was what they agreed the most appropriate title would be - likewise, Isabella referred to Mrs. Flynn-Fletcher as Aunt Linda), ate breakfast, and walked across the street to greet his siblings.

While crossing the street, Phineas bumped into two more of his friends - Baljeet and Buford. Right now, the two were unaware of what events had transpired yesterday.

"Hey Buford. Hey Baljeet." Phineas greeted the two as they walked up to him.

"Hello, Phineas." Baljeet replied. Buford, however, wasn't as nice. Not beating about the bush, the bully delved right into the heart of the matter.

"Hey, Dinner Bell. How come you're not in the backyard? It looks like you just came from-" Buford gasped, as he realized the implications that such a statement might have.

"Isabella's house," he finished slowly.

Phineas chuckled, well aware that the two kids didn't know. "Actually, yes. Yes I did," he replied cheerily.

Now it was Baljeet who gasped. "Did you have a sleepover at Isabella's?" the Indian boy asked.

"Well, that's one way of putting it," Phineas replied cautiously. He wanted Isabella to be there when he officially told the two boys the news.

"And you didn't tell us..." Buford said accusingly.

Baljeet stepped up again with a follow-up question. "Are you two in a relationship?"

Phineas chuckled again. "Like I said, that's one way of putting it."

He then pushed open the fence gate, to reveal Ferb and Isabella already sitting under the tree.

"I was wondering when you'd get here," Isabella said. "Oh, and I see you've brought Baljeet and Buford."

"Yeah," replied Phineas.

"Do they know yet?" Isabella asked.

"They've made guesses, but I doubt that either of them actually understand what happened." Phineas responded, puzzling both Buford and Baljeet. "I wanted to make sure you were there when we told them."

"Tell us what?" Baljeet asked. "That Isabella's last name will one day be Flynn?"

Phineas whirled around to face Isabella. "It better not be," he said, uncharacteristically strict. He then turned back to Baljeet.

"Actually, I was going to say that Isabella is my sister."

Baljeet gasped. "How does that work?"

"Believe me," answered Isabella. "I'm having trouble understanding it myself. Basically, my father and Phineas' father are the same man."

"Lawrence?" Buford asked.

"No - Phineas' real father." Isabella replied. "It's complicated."

"I bet," Baljeet said, in both agreement and disbelief.

"And I thought you two were dating." Buford said offhand. Of course, Phineas was destined to hear this, and further embarrass Isabella.

"What?!" the redhead screamed. "Me?! Dating Isabella?! Why would you think that?"

Isabella laughed nervously. As coolly as you like it, she turned to Phineas and said, "I have no idea. Must have been some fantasy of theirs."

Buford opened his mouth to protest, but a quick, menacing glare from Isabella shut him up. He knew better than to cross the Fireside Girl. That would lead him down a path he did not want to take.

"I am sorry," Baljeet said. "I am having trouble processing all this."

"Me too," agreed Phineas emphatically, taking his seat next to Ferb under the tree. "But I'll just focus on what to do today."

For some reason, that was the first time in a long time - thirty-five hours was a long time by Phineas and Ferb standards - that Phineas had even considered the question.

"What should we do today, sis?" Phineas said, trying out Isabella's new title on his tongue for the first time. "After all, there's a world of possibilities."

Isabella smiled. Maybe being Phineas' sister wouldn't be so bad after all.

Whew! That's the end of that story. If you want more stories related to this topic, just ask. I know you won't, though. Because really, who would want to hear more of this plot line? Please read and review, still. EpicThoth3 away!