Dipper is Female so she can give birth to all the kids ,but if you have a problem just pretend dipper is a boy. The house is the photo but bigger and more room like a mansion buts it is more bedroom than anything you know :-P 
NO POV
The house has Five bedrooms and a master bedroom, two bathrooms one in master bedroom, a basement, an attic, a big living room, a kitchen, a big dining room for all the family members, a kitchen, a porch, a playroom space and big yard since they live in the country. Dipper is currently in a cleaning frenzy she really wants everything to be perfect for her husbands arrival from a business trip since he owns a company he made called cipher real estate ,so they get money but eleven kids takes a chunk out of it.

"Oh Brian dear please don't solve for 'x' on the wall!" Dipper said taking Brian's markers "Use a pencil and paper instead please I'm begging you." Brian shrugged and walked away ,so Dipper could wash the wall.

"Poo-poo!" A diaper-less Bailey said waddling near Dipper a foul stench in the air making Dipper scrunch up her nose.

"Oh dear where's your diaper!" Picking the baby up into her arms Dipper takes her to her room where she steps in something "Oh there it is." She said disgust wiping her shoe off and wiping the baby down into a new diaper "There good as new! Aren't you! Aren't you!" She cooed making Bailey giggle and laugh at the touch.

"Parental unit might I ask why you are sanitizing our dwelling's surface area?" Brian asked making Dipper look down to see him mixing chemicals.

"You know you look so much like your Great-Grunkle Ford besides the grey hair and wrinkles." She ruffles his already messy hair "I'll tell you later after we pick up your brothers and sisters!" Dipper who is now holding both Bailey and Brian head out to one of the cars were she buckles them in much to Brian's chagrin "Hey when you 8 you don't have to be in these!"

"The tires could still blow off" he said stoically making His mom frown ,but she signs and goes straight to driving.

"Hey now Brooke will drive the other car ,so she definitely won't puke on anyone this time!" She got no response so they just kept quiet for the ride to gravity falls elementary school.

"Hey mom!" The twins Boston and Bonnie said together with their sister Babs and brother Blaine behind them.

"Hey kids i got a surprise to tell you !" Dipper said excitably as they enter the car confused "Hold on I got you!" She said buckling the twins into the car seats "Don't want my babies getting hurt!" She said in a baby voice squishing their cheeks "Now Brooke is taking the other car to pick up Bell, Blake, Brett and Braden! So when we get home I'll need you all to be on your best behavior! And no making messes! I'm looking at you Boston!" She did the 'I'm watching you' signal making the boy sulk and the girl twin laugh at him.

"What's so important that I can't roll around in the mud!?" Boston asked miffed. The others start mumbling comments about his filth.

"When were all home I can tell you~" Dipper sang making them groan  "So were going to wear the tuxes and fancy dresses!" They all groan again louder "Hey now the others have to.Hold on." Takes out phone "Hey Brooke put the phone on speakerphone please." Brooke does that "Kids you all have to wear fancy clothes like tuxes and Dresses today! And be on best behavior" Dipper hears her other kids groan "I'll tell you the details when were home." Dipper hangs up.

​​When the children got home their mother immediately made them change into fancy clothes but since its a Friday night many of the Kids wanted to go out and/or have fun. Blake, Brett, Braden, Blaine, Boston and Brian all have simple White tuxedos while Brooke has a light blue dress, Bell a light green dress, Babs a black dress, Bonnie a bright pink dress, Bailey has a lavender dress but you can still see her diaper, and Dipper has a light pink dress and her boyish hair has a matching bandana bow along with some makeup.

"Mom can you tell us why were doing any of this?" Blaine asked as the family sits in the dining room.

"Yeah this outfit doesn't suit me at all!" Brett said and laughed at his own joke "Get it!" Everyone except Dipper groaned.

"Okay I'm going to have to set some ground rules." Dipper said then stood and counted each rule with her fingers "No mud or anything filthy, no phones, no jokes, no taking off diapers, no experiments, no music, no comics, no sports, no talking about fashion, no negative talk, and no being a princess!" They all groan and fight-back at what she said "And no fighting because your father is coming and he's gonna be staying here For the foreseeable future!" Squeals in excitement "Isn't that fantastic!"

"Fantastic." They all said monotone not wanting to see their father.

"Okay then! Everyone gather you plates and silverwear for evening dinner! Cause he'll be here in 10 minutes!" Dipper happily walks into the kitchen to get the food while kids look like they've seen a ghost.

"Dudes what are we gonna do!"Blake said freaking out.

"Well whatever we do we gotta impress him! Cause we literally only see him once every few months for only like a minute and he's always awful to us! He only spends time with mom when he's here how can she stand him!"Brooke said.

"I say we teach him a lesson he'll never forget!" Braden said making fighting moves.

"Couldn't we like just mail him and get a new Dad?" Bell said making the kids roll their eyes.

"No!" Blaine said "If we could we would , but he's our father ,so we have to be on our best behavior.We're having pork chops tonight so that's a plus?"

​​​​​"KIDS!"Dipper yelled "Your father is here, so sit in your seats!" The kids all sit down nervous as the head of the table now have two chairs for their parents.

When Bill Cipher came inside he immediately kissed ,and hugged his wife smiling at each other then walking into the dining room to sit down. The Children see Bill hasn't changed at all he still has his blonde hair, a Piercing gaze judging them, his tall and broad form, a fancy black and gold suit, and a wicked grin that sends chills down their spines "Hello kids how your doing?" His voice still has its high authority making them feel small "Haven't ruined your mother yet?" He said with a dark smirk.

"Oh Bill stop it." Dipper giggled lightly shoving Bill's shoulders "You know Brooke got herself a boyfriend Landon I think?" 

"Yes Landon he's literally the best boyfrind ever! We totally said the same thing at the same time!" Brooke signed happily "Yeah it's like were literally meant to be!" Notices her father's questionable gaze ,so she coughed into her hand "But yeah he's great."

"Well good to hear I guess?" Bill said taking a bite a pork chops enjoying the taste "Oh hon! Just the way I like them!" Turned his attention onto Braden "So son your mom says that your a top athlete huh." Braden perks up.

"Oh yes I am sir! I'm on baseball, hockey, and football! So I dominate pretty much! But basically any sport I can do really!" Braden said getting excited but quickly remembered his manners so he sat back down.

"Hey Braden you play so many sports that you are a ball! A screwball that is! Ha get it!" Brett said laughing but his mom glare at him and he realizes "Oh I'm sorry! I forgot no jokes at the dinner table!" Brett quieted down but his dad started to chuckle.

"Oh you remind me of a young me!" Bill said laughing then looked at a confused Dipper "Please Sweetie the kids can be themselves I don't mind." This startled the kids.

"So I can do this?"Boston said taking his peas "Did any any some say peas?" He flicks his peas at bonnie who angrily flicked some back at him.

"Boston! Bonnie! No throwing your food!"Dipper said breaking the twins up.

"Don't be such a stick in the mud pinetree!" Bill said amusement in his voice. The kids look at a blushing Dipper who is embarrassed.

"Pinetree Your pet name is pinetree?"Brian said deadpanned making the kids laugh hard.

"How did you give her such an aweful nickname?" Babs said with no emotion "I'd rather wear pink then be named pinetree."

"Aw it fit her when she was younger! Her maiden name is Pines ,and she used to wear a pinetree hat all the time! I thought she was a boy!" Bill said making them all laugh at Dipper's expense who is currently a tomato spoonfeeding Bailey her mushed up food.

"Blake a distraction please!" Dipper whispered to Blake giving him his guitar which was under the table.

"GUITAR SOLO" Blake said jumping on the table and started to rock out on his guitar "STAGE DIVE!" He yelled jumped at his father and mother who barely caught him.

​​​​​​HOPE YOU LIKE IT!