"Jesse, Seth, if you're not out here in one minute you're staying home!" Danny called.

37 seconds later both boys appeared, ready except for their coats and shoes. Danny loved that his kids loved school. It didn't hurt that if they stayed home, there wasn't much to do during the day.

Once all three were ready to go Danny opened the door and herded them out. The boys were fourteen, and in high school. Danny had finally deemed them old enough to go to school by themselves. They went to the subway together, getting on different trains to get them around the city.

It was a slow day in the lab, and Danny would quickly admit he was bored. He saw Mac on the phone in his office, and though he didn't actually want it to be a call, because that would mean something bad had happened somewhere, he was hoping he'd be sent out, so he'd have something to do.

Mac walked into the break room where Danny'd been sitting.

"Danny, you're with me, dispatch got a call from St. John's Prep saying they found blood," Mac said.

"St. John's Prep?" Danny asked, the color draining from his face.

"Yeah, you got a problem with that?" Mac asked.

"There's a chance that there could be conflict of interest," Danny said cryptically.

Mac was about to ask the blond to explain when Danny's phone rang.

"Messer," he answered.

"Dad, before you ask, me and Jesse are okay. We're actually the ones who found the blood when we were going up to the loft to study."

"Thank God you two are alright, what can you tell me?" Danny asked. Mac was giving him a strange look. Danny tipped the phone away from his mouth and said, "It's Jesse and Seth, my kids, they go to St. John's Prep."

Danny turned his attention back to Seth on the phone. He was informed that the twins were keeping everybody away from the scene, and they'd wait till the authorities got there for questioning.

After Danny hung up the phone Mac said, "You will be explaining all of this on the way. What did they know?"

"Seth said he and Jesse were the ones who found the blood in the loft of the library when they were going up there to study. They have a corner that they always use way in the back where most kids don't go, so that's probably why no one found it earlier. They told the librarian to call 911 and went back up to keep the scene secured until we get there," Danny answered.

Mac was driving, and Danny was staring out his window, waiting for the other man to ask the inevitable questions.

"So," Mac started, "you have kids."

"Yeah, twin boys. Jesse and Seth were born on Halloween, 1993. They're mom, my late wife, died from labor complications just after they were born."

"You were married?"

"It was arranged by our families, before I became a cop and ended up the black sheep of the family. We got married the day after I turned 18."

"And you didn't have any say in this?"

"Let's just say objections would be answered by my dad's bodyguard. Not a guy you wanna mess with."

"So the two of you got married, had twins, then she died and you raised the kids?"

"That's the story."

Mac was silent the rest of the drive.

Flack met them at the entrance to the loft. Standing next to him were Jesse and Seth. Mac could see the family resemblance instantly. They looked just like mini-versions of Danny.

"Mac, we got a lot of blood. If it's human it's from more than one person."

"Hey Dad, nice to meet you Detective Taylor," Jesse and Seth greeted in unison.

"How do you know who I am?" Mac asked.

"Dad taught us to recognize everyone in the lab that he's in close contact with in case of emergencies. Just in case Uncle Don can't get to us first."

"Uncle Don," Mac directed at Flack.

"I've known them for years, I don't remember when they started calling me that," Don replied.

"Yeah, him and Aunt Aidan," Jesse said.

"Ok, Danny, I have to ask, how can you tell them apart?" Mac asked.

Jesse and Seth laughed, then Jesse answered, "He just knows."

Seth picked it up saying, "We did a comparison,"

"To see how identical we are,"

"And we couldn't find any differences,"

"We don't know how he does it," Jesse finished.

"Do you do that often?" Mac asked them.

"Yes," they answered in unison.

"Only difference I know of," Danny said, "is that they're mirror image when it comes to their dominant hands."

"I'm left-handed," Seth said.

"And I'm right-handed," Jesse ended.

"Alright, now that everybody knows everybody else, you guys have a crime scene to process, and I have to interview these two," Flack said.

Mac and Danny grabbed their kits from where they'd set them on the floor and headed over to the huge blood stain.

End of Chapter 1, let me know what you think! This is gonna be Mac/Danny/Don eventually.