Hi. I decided to redo this description in honor of all the support I'm getting. You guys are great!

Basically, I've noticed a lack of fanfics about a family connection that Sans and Papyrus has with Frisk, as well as fanfics about the origins of certain characters (spoilers) and fanfics that push these characters to their limits. So I decided to create a fanfic that is half fluff, half angst, and half mystery about the story. It's pretty well-rounded, in my opinion. Bone-ified Family was just some stupid name I thought, but honestly, it's sticking. I like it and probably will not be changing it. It gives you what you expect. It's about the two skeleton brothers forming a "family" with Frisk.

So, you can think of this timeline as being very close to canon. Some things will not be entirely canon (I have to put some creativeness into it), but anything that isn't canon fits into the world coherently, if that makes any sense.

Anyways, here's some heads-up headcanons for your information.

-Frisk is agender because it is confirmed. I am using they/them pronouns to keep it as close to canon as possible. If you see any other pronouns used, it's a mistake and you might want to tell me about it.

-Frisk (and other characters… shhhhh spoilers) speaks in sign language, but can hear and speak aloud. (It's explained, don't worry.)

-"CAPITALIZED ITALICS IN QUOTES" signifies when someone is signing in sign language. (The language will be kept as close to ASL as possible, so expect sentences like "MY NAME FRISK" instead of "My name is Frisk.")

-THERE IS NO FRISKXSANS! I should make it clear that there will be ABSOLUTELY NO SHIPS. (IF there is any, it will be canon ships and only light fluff… but that's an IF it's included.) Frisk is ONLY a child to Sans and Papyrus, and Sans and Papyrus are ONLY parental/brother figures to Frisk. There won't be any gray areas or "Maybe they like each other?" moments. I'm making that very clear from the start. Frisk is like 6 or 8, man. That's illegal.

-The only ship I approve of is Sans and Happiness and the more you read this fic, the more you will know that I obsess over this ship.

-The story begins from the very first time Frisk enters the Underground.

- …(Start/End)… signifies when the actual story is starting or stopping, so you don't confuse the story with my comments.

- … signifies a break in the story, a new setting, etc., etc.

-If you see any mistakes, feel free to tell me. I don't care. I'm only human. (See what I did there?)

Enjoy.

...(Start)...

"SANS! IT'S TIME FOR PATROL! I CAN FEEL IT THAT THE GREAT PAPYRUS WILL FINALLY CAPTURE A HUMAN TODAY! I SHALL BE SO POPULAR!"

These words woke Sans out of another dream. This one was not as bad as the nights before, however, all he could remember is the word "Sansy." It really could've been anyone saying his name in such a childish fashion, but to his knowledge, only Papyrus would use it. He didn't really get the chance to communicate with many children who would call him that.

"STOP BEING SUCH A LAZYBONES, SANS! WE WILL HAVE A GREAT DAY CAPTURING HUMANS AND BRINGING THEM TO UNDYNE! I CAN FEEL IT!"

Sans slowly opened his eyes and barely reacted as his brother lifted him up over his shoulder. This was another normal day. Papyrus would always force him off the couch where he would always reside during nighttime. The "stars" that always filled their sky seemed to have a cycle of night and day which caused Sans great despair. It seemed like he could never sleep in the pitch black of night.

Regardless, Sans knew he could find a way to catch a few zzz's during his shift. That's how he always did his jobs. No point in caring now. It's not like many humans came through the forest anyways.

A chill breeze hit San's bones. Not that it was unpleasant, but he knew that his day was beginning.

"SANS! WAKE UP! OUR GLORIOUS DAY HAS BEGAN!"

...

Sans reluctantly opened his eyes at Papyrus. He must've fell asleep as Papyrus carried him to his sentry station in the Snowy Forest and placed him on the desk of the station.

He instantly responded, "tibia honest, papy-"

"SANS! STOP THAT THOUGHT RIGHT THERE!"

"i believe…"

"SANS!"

"that…"

By this point, Sans was already snorting at his own joke and Papyrus was stomping the ground in a rage induced fit. It was amazing that Papy could generate so much emotion before the pun was even said. Sans looked at Papyrus with hopeful eyes. Without his brother, Sans didn't really see a point in anything. His brother made everything… so bright.

"SANS! I WILL NOT MAKE SPAGHETTI FOR YOU IF YOU CONTINUE!"

"it'll be…."

Papyrus shook his fist at Sans and glared at him with horrid anticipation. Sans had an idea to add more onto the pun. He jumped off the sentry table and started to tear up slightly.

"DON'T."

"filled with pasta-bilities of human knee-capturement!"

Sans was crying at the glorious arrangement of puns he uttered. Papyrus threw his hands in the air and yelled at the twinkling sky.

"I HATE YOU! THIS IS THE WORST DAY OF MY LIFE!"

Tears streamed down Sans's face.

"oh my g-"

Sans was on the ground snorting, snotting, and crying. He had not laughed this much in a long time.

"SANS? WHY ARE YOU CRYING, YOU FIEND!?"

"that… was the most… beautiful thing i've ever uttered."

"STOP IT. DON'T SAY ANYMORE! WE HAVE WORK TO DO! I AM GOING TO CALIBRATE MY PUZZLES. YOU STAY AND CHECK FOR HUMANS, DEAR BROTHER!"

Sans regained his breath and stood up as Papyrus stormed past him. The last thing he saw on Papy's face was a smile. Sans knew Papyrus loved jokes and puns as much as he did, but what Papyrus didn't know is that Sans knows he has these rages to make his brother happy. Sans smiled brightly once again. The thought of his brother doing everything to make his life a little easier filled him with such joy. Papy knew of Sans's powers and abilities, but he didn't care or intruded. He merely wanted Sans happy.

Deciding to grab a quick snack, Sans reached in his inner jacket pocket and pulled out an emergency bottle of ketchup.

"i'll ketchup to you later bro," Sans laughed before he took a drink of the substance.

Sans began to choke as he heard a "SANS! OH MY GOODNESS! YOU WILL NOT STOP!" in the background.

He coughed the ketchup onto the ground from laughter, however, his happiness was interrupted.

The coughing turned quickly into a gasp. The ground was covered with ketchup. Or was it blood? He looked up and saw a living memory in front of him. His brother began to evaporate into dust as large vines wrapped around him. The origin of this vines were none other than Flowey. Sans whimpered at the sight of this. As he began to attack Flowey with tear filled eyes, a vine cut him across his chest and Sans coughed up blood, just like now.

Sans slowly placed the ketchup bottle inside his jacket pocket. He should be used to these by now. He took a deep breath and reminded himself that it was just a bad dream and he was only anxious. The anxiety of having multiple jobs can do that to you.

"i have to distract myself."

Sans knew the answer to this. He looked across the snow covered path that lead to a door to the ruins. He knew that the strange woman would be there with her jokes to distract him from these hallucinations. He ran across the bridge and towards the large, looming door.

He stopped in front of it and cleared his throat.

"knock, knock!" He cheerfully said as his knuckles performed the same action on the door.

A gasp and "Who's there?" reached Sans. He frowned. Her voice sounded more scared than excited as it usually is.

"figs."

A small pause. Sans knew instantly that the woman would have been excited for a plant related joke.

"Figs who?"

Sans tapped the door lightly.

"figs this doorbell! it's broken!"

The woman laughed, but it seemed to be repressed, as if something was on her mind.

"Nice one, friend," she sighed.

"you seem to have something on your mind."

Sans shifted his weight and stood uncomfortably as the woman took a near minute to respond.

"Doorperson."

Her voice felt closer, as if she was leaning against the door. Sans walked closer and listened for her words.

"If... If a human ever comes through this door…"

Sans gasped. Bad memories flashed back to him. Humans? They were unpredictable. You never knew what could happen… He repressed these thoughts as he listened closer.

"Could you please, please promise something?"

Sans began to reject the promise, "lady, don't you remember the last time i took a promise?"

"Watch over them, and protect them, will you not?"

"lady, every human who has ever passed these doors always ends up dead."

"they will not listen to me… please promise me. i hear them coming."

Sans reluctantly said yes, but knew he could never keep such an outlandish promise.

"Goodbye," she cried from beyond the door.

Sans took a step back. He felt a shiver go down his spine as he turned on his heel and paced himself to the side of the trail and into the forest. He had met humans in the past before. The first human, Chara, was a devil within the body of a child. He didn't want to tell Asgore the truth of Chara, as the King was still grieving over their death. To do so would cause Asgore to feel even guiltier for the death of his other child.

Then, there was the other children. Some of them he didn't meet at all, but others… he wish he never did. The guilt was too much.

Honestly, it was a miracle that their DETERMINATION didn't reset them. It didn't make sense at all.

Sans found a rock to sit on that allowed him to see the trail from a distance. He cracked his bony knuckles – Sans laughed at the thought – and relaxed. He looked up towards the stars. They were absolutely beautiful, but Sans was one of the only monsters that knew that they weren't true stars.

Real stars didn't give off light like they did. Rather, they fade into light that determines the day on the surface. That was what some of the old science books from the surface explained.

"sigh, hence is why i love science." Sans snorted out. That was a terrible one. Too bad Papyrus couldn't listen to it.

Sans sat there and observed the roof of the cavern as he waited for the doors to open. He could sense from the doorwoman's voice that a human was to come through again. Maybe he could lead them on the correct path this time.

But before he knew it, he jumped. He had carelessly fallen asleep like always. Normally on a job like this, he wouldn't have care at all, however, with the inclusion of a human, there was no time to be wasted. He knocked his skull loudly with anger as he rushed onto the trail.

His heart dropped as he saw tiny footprints. He looked right and saw the human slowly taking steps and frantically looking left to right. They were small enough for Sans to carry. From his observation from other humans, this was a small child, maybe around the age of one of the other children, who was roughly 8.

Sans knew first impressions were everything. Perhaps he could get a joke in. He took giant steps as he followed the child.

SNAP!

He cursed himself as he ducked behind a fallen log.

The child quickly turned around and Sans could faintly see tears streaming down their face. He quickly began to move among the forest closer to the human. For once, Sans felt like he was on some sort of an adventure. He smiled and held onto the feeling while it lasted.

Sans quickly ducked again and cursed himself. The human saw him and gave a small cry. They quickly turned and began to jog towards the bridge.

"come back here," Sans whispered.

He quickly jumped onto the trail and got an emergency whoopee cushion from his other inner jacket pocket. He had emergency supplies for everything.

Sans deepened his voice as he spoke, "human, don't you know how to greet a new pal?"

The human froze in their spot. Now that Sans had his chance, he took slow, large steps towards them. Their body and face was large and bony, just like Sans. At least he now had someone with his body type.

"turn around and shake my hand."

The child reluctantly turned around. On their face was pure terror. Sans instantly felt guilty of the promise he had just made. After meeting the other children in the past, it was amazing he had not went back on his old habits.

They reached out and slowly grabbed his hand. Sans smiled as the whoopee cushion FLUUUURRRRGHED.

The child was confused for a second and instantly began to laugh. That's how some of the humans he knew reacted before… He shook the thought off. He made a promise.

Sans laughed as well, "the old whopper cushion in the hand trick. it's ALWAYS funny."

The child let go of Sans's hand and what they did shocked Sans. They took the side of their pointer finger and began to rub their nose, as if there was a spot on it, but Sans instantly knew what it meant.

This child could speak like the man who spoke with hands.

This child was different. Things were about to get interesting.

...(End)...

Thanks for reading the first chapter. Because this is an introductory chapter, it's mostly exposition. The fluff, angst, and suspense will come later, but don't worry, it's there.