This is a AU where Sans and Frisk are married and have 3 children Francine, Sophie, and Sans Jr. (Or referred as just Jr.). Francine (15) is a skeleton like her father but she is completely devastated when she learned she has no powers like her younger brother or sister, but she learned that she doesn't need her father's powers to be strong by taking Karate and Self-Defence classes. Due to her being a skeleton it's decently hard to tell if she's a girl if she doesn't talk and is mistaken as a boy which really effects her negatively because of this she is bullied alot and ignored, she likes puns and helping others when she can... Sophie (11) is a Human who likes puns but inherited her father's magic and she's trying to learn how to control her powers and hates School, her eyes has a blue glow to them. Sans Jr. (10) he is a skeleton monster like his dad but he has a very negative attitude and outlook on things in general, he hates school, Puns, Loud music, big crowds. He usally takes walks outside to clear his mind and think, he also likes reading making him really smart for being 10. They all attend Toriel's school for both humans and monsters alike and like hanging out with eachother. Sans and Frisk both try to raise them the best that they can but are a bit afraid of Francines bully problem and a tiny bit over Jr's negative outlook... During Frisk's class she walks in the front of her class to make a announcement

Frisk: Class we have a special guess for class today... I'll be watching in the back she sits in the back and watches Sans with a smile as Sans stands in the front of the room Sans: heya... names sans, sans the skeleton but you all probably know that already Sans shrugs and takes a sip of his ketchup in his bottle as he takes off his jacket and rubs as he sets the jacket over Frisk's seat and begins teaching the lesson over the souls intermixed with puns, Frisk falls asleep and later wakes up to 3 students still listening to Sans and the other students appeared to leave, she smiles faintly