Delilah returns to Washington in season 12 and they resume their relationship. He proposes to her in the episode "Love Boat", which she happily accepts. They are married in "Something Blue" shortly after finding out that they are expecting. In "Voices", McGee learns that Delilah is having twins; a boy and a girl and in the next episode, she gives birth to John "Johnny" McGee, named after Tim's father, and Morgan McGee, named after a former cop turned security guard who died saving Tim's life.