They appear right outside of Professor Pines house.

Mrs. Diaz groans "CAN I TAKE OFF THE STUPID BLIND FOLD NOW?!"

Mr. Diaz scratches his head.
"I concur, this is quite itchy on my smooth dolphin skin."

Star squeals "YOU CAN TAKE OFF THE BLINDFOLDS NOW!"

They take off the blind folds, Dipper and Pacifica standing right in front of them.
They all stare at each other.

Star turning her head back and forth.
"Uuuhhh...
to be honest this isn't exactly the reaction I expected..."

Mrs. Diaz starts to talk "D-d-d-d-dipper?...
is that r-r-r-really you?..."

Dipper walks up.
"It's really me."

Pacifica gets in the middle "Excuse me...how do you two know each other?!
What is she? some ex girlfriend or what?
Cause I know how you like red heads..."

Dipper laughs "Hahahahahaha,
Hon it's not like that...
Pacifica... you remember MABEL don't you?"

Pacifica screams "M-M...MABELL?!...
B-but..HOW?!"

Mrs. Diaz sighs "That's what i'd like to know..."

Star sighs "Can someone please tell me...
WHAT ON EARTH IS GOING ON?!"

Marco scratches his head.
"Mom, why did Professor Pines just call you 'Mabel?'"

Mr. Diaz then walks over to Dipper.
"Dipper Pines, long time no see."

The two exchange a friendly hand shake and hug.
Dipper replies "It's' good to see you Mermando."

Marco interrupts "WHOA WHOA WHOA,
MERMANDO?! Hold up...
I think you guys owe us an explanation..."

'Mabel' sighs "Star Butterfly... I can't thank you enough..
..but this was incredibly stupid, and I fear the consequences of what you have wrought."

Star smiles "It was nothing really...
but can you please explain this whole mess to us?"

'Mabel' sighs again "My real name...is Mabel.
and Marco your father's name...is Mermando.
We had to change our names years ago, to keep ourselves safe."

Marco tilts his head.
"Soooo... how do you know Professor Pines?"

She hugs him "Because Professor Pines...
is my brother."

They scream "WHAT?!"

Marco points to Dipper "BUT HE SAID HIS SISTER DIED!"

Dipper replies "I had to, I couldn't let anyone know she was still alive...
and there's an important reason for that, perhaps you'd like to explain it sis?"

Mabel nods.
"I will...
it all started here... in Gravity Falls."

END OF CHAPTER