"It's us!" Mark called out as he walked into Arizona's house.

She and Alena had bought it six months ago when they started trying to have another child. Mark and Lexie had moved into a house about a year ago as well, so Sofia was enjoying having more space to play and two backyards. Now that her parents lived farther apart, she did express feeling like she was missing the others when she was away, but they did their best to make it work. Overall, Sofia was a very happy eight-and-a-half-year-old.

"Cole!"

Sofia ran out of the kitchen and went to meet her dad and her little brother, thirteen month old Cole.

"Are you baking?" Mark asked when he saw his daughter's personalized purple apron was on.

"Yep," she said.

"What are you making?" he wondered.

"Cookies that look like the states," she said. "Alena says yummy stuff helps me learn gooder."

"Does she bake anything to teach grammar?" he joked.

"No."

"Hi," Cole smiled.

"Hi, Cole," Sofia smiled, taking her little brother's hand. "Wanna come in my kitchen and make cookies?"

"Hi," he said again.

"I already said hi. Say 'yes, Sofia!'"

Cole shook his little head as they walked into the kitchen. "Is that asking too much?" Mark laughed.

"Hey, Cole!" Arizona smiled. "Did Daddy bring you over here to hang out with us?"

"Say 'hi' to them," Sofia told her brother.

They didn't understand why – because he loved Arizona – but he would always play shy with his sister's mom. He found ignoring her absolutely hilarious, even though she was also one of his favourite playmates when he'd forgot about playing shy. He probably did it just to get attention, and it worked. The adults found it just as funny as he did.

"Hi, Cole," Alena said.

"Hi," he replied in his tiny voice.

"How come she gets a hi?" Arizona questioned. "Silly boy!"

"Can Cole help us bake?" Sofia asked Mark.

"Yep," Mark said. "Actually, I'm not staying long. I've gotta go to work."

"Oh."

"But Cole's gonna stay here until Lexie can get him."

"Okay!"

"C'mere, Big Boy," Arizona smiled picking the toddler up and sitting him on some empty counter space.

Cole giggled.

"Cole, if you help bake, you have to do a good job," Sofia said. "This is for my school. It's important."

"He'll be a great helper," Alena smiled. "Right?"

"He doesn't have an apron that says 'Cole'," Sofia replied. "Like I have a Sofia one."

"That's okay," Arizona said. "Maybe we can get him one."

"And the new baby," Sofia decided.

Alena was just shy of her twentieth week and they had found out today that Sofia would soon have another little brother.

"He'll need one too," Alena agreed. "Yep."

"He?" Mark asked. "You caved and found out? After you and Callie insisted I wasn't allowed to when she was pregnant?"

"Sofia begged," Alena replied. "Huh, Sof?"

"Yep," she said. "'Cause I wanted to know."

"Are you happy it's a brother?" Arizona asked.

"I wanted a sister," she answered honestly. "I already have a brother."

"You have a sister, too," Mark laughed.

"But she's big and she don't live here."

"I know."

"But I'll like two brothers," she smiled. "Then the next time, it could be a sister."

Arizona laughed. She was looking forward to having two children, but three wasn't the plan. Two would be it for their family. They didn't feel like they could handle more than that. Plus, it was sort of nice that they'd have one of each. It felt balanced and right.

"You're gonna have to talk to Lexie about that one," she told her.

Cole had been busy dipping his hand into some flour and he placed it on Alena's rounded belly. "Well, thanks!" she smiled. "Did Sofia's other brother need some flour?"

"Yeah," he nodded.

"He did?" Alena asked. "I think you just like messes."

"Yeah."

"Is making cookies fun, Cole?" Mark asked, taking a picture of the kids with his phone and sending it to Lexie.

"Yeah."

"Do you like the word 'yeah?'" Sofia asked.

"Yeah," he nodded.

"Will you talk to me?" Arizona wondered.

"Yeah," he answered.

"Gotcha!" she replied. "You talked to me!"

"I'm gonna know how to take care of Robbie," Sofia said as she helped Arizona fold receiving blankets that they had just washed and dried so that they would be ready for her new brother's arrival.

"You are, huh?" she asked. "Even how to change his diapers?"

"Just pee ones."

"I see."

"Because I help with Cole."

"I know."

It was cute to see how excited Sofia was for her brother. They knew she would be, but they didn't realize just how much she'd want to help with. She hadn't helped out as much at first with Cole because she had been unsure about how. Now that their baby would be her second baby sibling, she was acting like the third mommy. Of course, they wouldn't expect her to do their jobs or anything, but an extra hand once and awhile would be nice.

"I hope Robbie comes tomorrow," she said. "Because it's Saturday, so I won't be at school."

"Well, we'll see."

"And I don't wanna be at school. I wanna get to meet him soon."

"I know," she said. "Whose birthday is Tuesday?"

"Madre's."

Arizona was hoping that her son would arrive any day but Tuesday. While she couldn't wait to meet him, she didn't want to have to associate his day with Callie. She had moved on and she loved Alena, but that didn't mean she didn't still love Callie. It wasn't as if they had broken up or something. No, Callie had died leaving her daughter behind to be raised by just Mark and her. She couldn't help but keep Callie's memory alive in her mind and heart. Luckily, Alena understood this.

"Yep."

"How old would she be?"

"Forty-three," she answered.

"That's old."

"I'm older than that!" she replied. "Only by a little bit, but…"

"You are?"

"Yes!" she laughed.

"You don't act old."

"Gee, thanks."

Big Sister Sofia got her wish. Robert Allan Timothy Felix – his middle names being after Alena's dad and Arizona brother – was born the next day. It actually happened in the middle of the night, at two in the morning.

Sofia was over at Mark's and fast asleep but she woke up when she heard the phone ring. Mark and Lexie assumed she was still fast asleep, so they didn't go tell her yet.

"Is Robbie here?" she came downstairs to ask after waiting and waiting.

"Yeah," Mark nodded, holding out his phone to show her the picture Arizona had sent.

"He's little."

"You think that's little?" he asked her. "You were just a pound when you were born."

"Because I was early, Daddy."

"Yeah. But still. He's not little compared to you."

"Can we go see him?"

"Not yet, Honey," Lexie said. "Alena and Mommy are gonna get some sleep. In the morning, we'll go meet him, okay?"

"Promise?"

"Of course! You're the big sister."

"You can stop doing assessments on him," Alena laughed as she watched Arizona checking Robbie over again.

"I'm not used to healthy kids," Arizona admitted. "Sof was a micro-preemie and all my patients need surgery."

"Well, he's healthy," Alena smiled. "Right, Little Man?"

They could hear the commotion that Sofia and Cole always created in the halls of Seattle Grace Mercy West. Their fellow surgeons and all of the nurses always felt the need to 'ooo' and 'aww' over the siblings.

"Your sister and Cole are here," Arizona said as she picked him up. "And soon, people'll be doing that to you, too. Because you're cute!"

They walked in. "Hey, Big Sister," Alena smiled.

"Hi," she said quickly. "Can I hold him, Mom?"

"Nice to see you, too," Arizona laughed. "But yes. Come sit."

Sofia sat on the foot of the bed and held out her arms. "One hand on his head, and the other on his bum."

"I know," she said with an eye roll.

"Well, okay then, Miss Big Sister Expert."

"That's me!" Sofia told her little brother.

"Robbie, this is Sofia. Your sister."

"And my daddy and Cole and Lexie came, too."

"Baby!" Cole squealed.

"Yeah, Sofia's got another baby brother!" Mark smiled.

"Baby!"

"I think somebody wants his own brother," Alena commented.

"Dream on!" Lexie told Cole as she kissed his cheek. "You and Sofia keep us busy enough!"

"Busy?" he smiled. "Busy lot, Mama?"

Now that he was eighteen months, his vocabulary was taking on a life of its own.

"I am busy a lot," she nodded. "Yes!"

"Ohhh…!"

"Cole, I can share my baby brother with you," Sofia compromised. "You'll be friends."

"I'm sure they will," Mark nodded. "Right, Cole?"

He nodded. "That baby?"

"That is a baby," he laughed. "Yes. Arizona and Alena had a baby! Robbie's his name."

"Ohhh…!"

A/N: Yes, I realize Robbie is also Izzie's mom. I've decided that since Izzie has nothing to do with this fic, and since Arizona's last name is Robbins, I don't really care in this case. It fits here. Plus, I prefer Robbie (well...Robert) on a guy. It's just not a girl name to me. (No offense to anybody who likes Robbie for a girl or anything lol)