Mike had no idea he had a daughter, he had no idea that he had a 20 year old daughter at that. At the age of 18 before Mike went away to the army he got his long term girlfriend at the time pregnant and now 20 years later. When Mike's brother Mathew DNA is found at a crime scene and they run it and she comes up as a match for a neice Mike feels his stomach drop. She's in the system cause she's a high profile translator for the UN. What the hell is Mike gonna do he goes to his father about who tells him to get in contact with her. So Mike does he calls her office and she picks up he talks to her for a minute before deciding not to tell her over the phone and asks if she can come into the precinct. She does she walks in Will Mike's father is in with Olivia Benson watching he sees her walk in she looks exactly like Mike and him. Mike greets her a little awkwardly as he takes her into a room so they can talk.