Tony 43 Team Gibbs
Dean 33 Tony
Sam 29 Ziva
McGee
Tony DiNozzo was not always a DiNozzo. He used to be Anthony James Winchester. When he was fourteen he lost his mother to Azazel, and his father to an obsession. At eighteen he lost his brothers to his need to get away from the hunt, leaving his eight year old brother Dean to look after four year old Sammy and a father who could barely look after himself.
25 years later, Team Free Will, consisting of Dean, Bobby, and a friend of John's from his marine days, Special Agent Gibbs, just lost their angelic friend Castiel to the Leviathans. Sammy never left Stanford with his brother, kicking him out and disowning him on his birthday, but kept in touch with Tony over the years.
Special Agent Gibbs was introduced to Dean after Sam left for college and helped Dean through Sam's abandonment, losing his father, when he made the deal to save Bobby's life (Sam was never killed because he was still at Stanford after Jess was burned, staking it up to an accident since he wasn't home), when he came back from Hell - enduring forty years on the rack, never breaking, when he came back from the Cage, when he got his soul and memories back, and lost Cas to the Leviathans. He called in some favours over the years since reconnecting with John for help on cases that had supernatural circumstances. John being too busy with leads on Azazel sent Dean to help. As soon as Dean walked into the Bull Pen he immediately recognized his brother, but Tony never recognized him so Dean used an alias. After wards Dean realized it was also a way to keep an eye on his brother.
After going to bed one night, Sam, Team Gibbs, Fornell, Vance, Bobby, and Dean wake up in a mysterious place with a fully stocked kitchen, bedrooms, and a large furnished common area with a large screen. Every person with a weapon in the room immediately drew them and began to take stalk of their situation. Fornell and Vance recognizing Dean as one of the FBI's most wanted immediately went to take down Dean, subsequently exposing him to the Team. Gibbs vouches for Dean and explains how they met while stating that he would trust him with his life and has many times.
Meanwhile Bobby notices a paper on the short coffee table in the center of the room. The paper was a note explaining that they were going to watch Dean's feats after Sam turned him away. What surprised the hunters the most was who signed the note, the archangel Gabriel.