AN: This is my first attempt at a crossover, so here it goes.

"Jethro." Gibbs turns and sees his father standing around the bull pen. "Dad, what are you doing here?"

"I can't come and see my son?" Gibbs just shakes his head, but then his phone rings.

"Sorry dad, but the director wants to talk to me about something."

"That's okay. I will just go and get something to eat and then meet you back at your place." Gibbs nods and agrees to that.

Jackson leaves and then asks for directions to a good diner from the cab that he had taken. The cab driver suggests the Royal Diner as a great place to go. Jackson nods and asks to be taken there.

Booth and Bones are at the diner eating and discussing their current case. "Bones it was him, I could feel it with my gut."

"Your gut can't speak. How many times do we have to have this conversation?" Booth just smiles at her as she steals one of his fries.

He is facing the door so he sees when Jackson comes in. He is confused for a moment before shrugging, "Pops!"

Jackson is confused when a young man calls him pops and then gives him a hug. "Sorry, but do I know you?" Booth looks a little hurt until Bones comes over.

"Booth what's going on?" Brennan looks over at Jackson and stares at him unnervingly. Jackson starts to fidget for a minute. Brennan looks between him and Booth for a moment before she nods.

"Booth this isn't your grandfather." Booth turns to her confused, "What are you talking about Bones? I know who my grandfather is, he raised me!"

"Yes, I know, but this man is not him. His facial features are very similar to Hank's, but there are certain areas that are not the same. If anything I would say that your grandfather has an identical twin."

"Whoa, lady. I think I would know if I had a twin don't you think?" Jackson is really confused over what this 'Bones' lady is talking about.

"Not if you were separated at birth." Booth squints at him for a minute before nodding. "Sir what is your name?"

"Jackson Gibbs." They shake hands and both of them can see that the other had some kind of military experience.

Brennan is just watching this go on for a minute before she shakes her head. "If we want to figure this out, I say we head over to the retirement home that Hank is in and discuss it with him. You can meet him and then claim that you don't have a twin. I am never wrong about these things."

Booth nods, "That's true, she usually isn't wrong about these things."

Jackson just sighs before gesturing that they go first. They head to Booth's SUV and get in.

On the way to the retirement home Booth decides to start a conversation. "So Jackson were you ever in the military?"

"Yes I was a pilot."

"My grandfather was a MP."

Brennan waits for a lull in conversation before looking at Booth, "You know this could end up being similar to a case that Sweets was on recently where the twin was killed and he was also separated at birth."

"What case?" Jackson asks.

"Oh Booth works at the FBI and I work at the Jeffersonian Institute."

"Feds huh. You ever work with NCIS?"

"No not really, that is someone else's problem." Booth says before wondering, "Why do you want to know."

"Well my son works at NCIS, Leroy Jethro Gibbs." Booth smirks a little at the name before Brennan notices, "Why are you smiling at his name, you hate your name too, Seeley." Booth glares at her a little.

Jackson looks between them, "Are you two a couple or what?"

Brennan looks at him in confusion, "I don't know what that means. If you are asking if we are partners then yes, but if you are asking if we have intercourse as well…" Brennan turns to Booth in question, he just shrugs his shoulders. Brennan continues, "We are in a monogamous committed relationship. Oh and we have a daughter together." Booth just smiles at her and then looks at Jackson who is confused.

"You get used to her blunt statements." Jackson just nods along.

They arrive at the home and head to the front desk. "Booth here to visit my grandfather Hank Booth."

They head in and see Hank in the middle of a group of women making them laugh. Brennan smiles, "I think he is looking for a crochet partner again."

"Bones! Really stop that." Booth shakes his head before heading over to Hank.

"Hey Pops!" Hank looks over and sees Booth, "Shrimp!"

They hug and talk for a few minutes before Hank questions what he is doing here. Brennan has come over, "We are wondering if you had an identical twin growing up." Booth just looks at her, Brennan shrugs.

Hank is confused, but says that he doesn't think so, "Why are you asking that?" They look over at Jackson, who has been standing in shock at the fact that Hank looks just like him.

They meet in the middle and stare at each other, "Wow we look just like each other, but I don't remember having a brother. When were you born?"

They started to discuss what has happened in their life and were seeing similarities and differences all around them.

Booth and Brennan were off to the side just watching them talk. "Bones, what do you think?"

"I think that you have just gained an Uncle that you never had before and I think that he should probably meet Christine if you plan to invite him here more often."

Booth smiles at her, "You are great Bones." Brennan smiles just before he kisses her. He then heads over to the two brothers, "Hey guys, I would say let's get a DNA match just so that your son doesn't think that something fishy is going on here and then what do you say we head over to our house and you meet our daughter."

They look at each other before agreeing. Booth shakes his head, 'a few minutes together and they already have that twin thing going on.'

They head over to the house where Max is looking after Christine. He looks up and gets confused when he notices two of the same people in the room, "Okay which one is Hank?" Hank raises his hand.

"Alrighty then." Max stands up, "Christine is taking a nap, so I will leave you to it." He hugs Brennan and pats Booth on the shoulder before leaving.

They are talking about nothing in particular when Brennan goes up to check on Christine and comes back down with a wide awake child. They gather around and Jackson smiles, "It has been so long since I have seen a little baby girl." He gets a little teary eyed and that causes everyone to look at him in concern.

"What are you talking about Jackson?" Hank asks him.

"This probably isn't my story to tell, but I am family and I am talking to family. My son was married and had a little girl, Kelly, but they were killed a long time ago and my son never got over it."

Brennan, Booth, and Hank stare in shock before Brennan gives him a hug and then lets him hold Christine. Jackson smiles.

Later that night Booth is getting ready to take Hank back to the retirement home. Jackson says goodbye to Brennan before they left. They were driving to the home when Booth looks over at Jackson, "Whenever you want to visit, just come by or let us know and we will come get you."

Jackson smiles at him and nods agreeing to that plan. Booth drops off Hank and then Jackson before heading back home, although he keeps in mind the address for the son of Jackson.

Booth gets home and sees that Brennan is putting away dinner and Christine is nowhere to be found. "Hey Christine asleep?"

"Yes." Brennan looks at him. "How do you feel about all of this?"

"I don't know. On the one hand I'm happy that I found some family, but on the other I am not sure how well the son is going to act. I am just trying not to get my hopes up on more family that is good and not at all like my father." Brennan smiles at him.

"It's okay to feel that way Booth, and remember, there is always more than one kind of family. Although maybe you should look into the son, I mean he is a federal agent so he is probably an okay agent, not as great as you, but still."

Booth smiles at her in gratitude, "Thanks for that Bones." They kiss and head to bed.

Gibbs comes home and finds Jackson getting ready for bed. "Hey dad, how was your day."

Jackson pauses for a moment before shaking his head, "It was a good day." Gibbs nods before also heading to bed.

AN: The next chapter is going to be after a few weeks or a month after, but Gibbs won't find out until that chapter.