Previously...
Cosmo bit his lip, "I... could feel a connection. A connection between Dipper and that... demon friend of theirs. Didn't Mabel say that he was Dipper's boyfriend? What if... they were our parents?"
"Oh, come on, Cosmo! They're both boys! Besides, didn't he speak as if him and the boss, our father, were two different people?" Luna asked, not convinced.
"Sorry Luna, but... I have to agree with Cosmo on this one... Didn't he know a lot about us? As if we had met before? Besides, we don't know anything about demons, except that they have to do with the underworld... Besides, don't you think it's weird that he never told us his name?" River asked.
Luna sighed, giving in, "Yes, he did... Maybe... True... he never told us his name..."
"Besides... why would he have that book in the first place? Doesn't that raise a few questions?" Cosmo asked.
Luna admitted, "I don't know... Yes."
"Well... let's go tell them our theory."
Cosmo gulped, "Wait... can I see that picture?"
"Uh... sure?" River questioned, pulling the picture out of her backpack, before giving it to him.
Cosmo stared at it, "Four of the people in the picture have this... aura... it is really dark, almost... like they made deals with the devil..."
"Who?" Luna asked, curiously, looking over at River.
Cosmo sighed, "Mabel, Dipper, and... these older men. I don't know their names... although, one goes by Ford, and the other goes by Stan."
"Anything else you can tell us?" River asked.
Cosmo frowned, "Dipper and Ford's aura's are way darker than the other two, almost like... they had cases of... possession."
"Possession?" River and Luna repeated, looking at each other, "What's that?"
Cosmo sighed, "It's more common in ghosts, but... sometimes... it could be worse. It pretty much means, that... something like a ghost, or worse, has taken control of your body, and you can't do anything about it. That's what it is."
"That doesn't sound good at all..." Luna frowned.
River nodded, "No, it doesn't. Should we ask them about it?"
"I think we should. I mean, we already want to say that they're our parents, so..." Cosmo stopped.
Luna and River nodded, "Okay."
The triplets ran back to Gravity Falls, smiling when they stopped at the shack, "Hello? We need to talk to you!"
"Yes?" Bill asked, opening the door. 'Please don't tell me that they've figured out who their parents are... I'm trying so hard to make it take a while.'
River smiled, "Hello, sir. We're looking for Mabel and Dipper Pines."
"Why?" He asked. 'Please don't tell me one of the kids can see auras... Please don't tell me one of the kids can see auras... Please don't tell me one of the kids can see auras...'
Cosmo sighed, "We're wanting to ask them about our parents and... why they made deals with... the devil..."
"How do you know that?" He asked, panicking. 'No, no no no! One of them can! No!'
Cosmo frowned, "I could see auras in a picture of a lot of people... and you were in that picture... why?
"Uh... Well, I'm their friend..." He smiled.
Cosmo smiled, "Well, we were wondering if they knew our parents..."
"I'm not sure if they would, I'm just their friend..." He lied. 'If they asked them, Shooting Star would probably tell them... because she would get super excited and then she'd tell them...'
River smiled, "Could we talk to them? Could we ask them some questions? Could you also answer some questions?"
"Aren't I already answering questions? So, yes... I'll answer your questions. Sure, you can talk them. I'm sure they wouldn't mind answering your questions," He smiled, letting them inside.
Mabel gasped, noticing the children, "Oh my gosh! You three look adorable now!"
"Now?" River asked, "Did you know our parents?"
Mabel laughed, "Know them? They're-" "- Don't you dare tell them, Shooting Star," He scowled, interrupting her.
"Shooting Star?" Luna repeated, confused, "We thought her name was Mabel... so why are you calling her Shooting Star?"
He looked down, "There's many reasons, but... that doesn't matter right now."
"Why not? You never told us your name. Why?" Cosmo asked.
He sighed, "Because it's something I'd rather keep to myself..."
"Why? Are you hiding something from us? Is that why?" River asked, pouting, "You don't think we'd be able to handle the truth, do you? Well, we're eight, and we can handle more than you can!"
He laughed, "I doubt that you can handle more than I can. Yes, I am... Yes, that's why. It's to keep you safe."
"Keep us safe from what?" Luna asked.
He sighed, "A lot of things, really... Will, what you can do... many other things."
"Who's Will?" Cosmo asked, curiously.
He bit his lip, "My little brother."
"Wait... you're... our father?" River asked, after putting everything together, pulling out the spell book and the picture.
He smiled, seeing the spell book, "Yeah, I am... and that was mine."
"Can you tell us who everyone in this picture is?" Luna asked, looking down at the picture.
He nodded, "Shooting Star, Pine tree, come here."
The twins walked over to him, smiling. Actually, Mabel was the only one who was smiling, "Did you tell them?"
"I didn't have to. River figured it out," He smiled.
Dipper grinned, "Good job, River! You're a really smart girl."
River blushed, her face turning red, "I'm not really smart..."
"Well, I think otherwise," Dipper smiled, happily.
River smiled, "Thanks... can you all tell us who everyone is?"
"Sure. It's not that hard." He smiled, looking the picture over, "Let's see... Pine Tree, Shooting Star, Fez, Sixer, Blue, and... me."
Mabel grinned, "He makes up weird nicknames for everyone."
"Not everyone Shooting Star, just 11 special people," He sighed.
Dipper sighed, "Alright, fine. Mabel, Great Uncle Ford, Grunkle Stan, Will, Bill, and... me, Mason, alright I usually go by Dipper."
"There's... something unnerving about the picture..." Cosmo spoke up.
"Like what, Cosmo?"