Sole Sister (S01E04)

Martin's adventurous sister unexpectedly drops by New York and pays a visit to him at work. He tells Eddie about Susan's arrival and asks him to give her a tour of the city. Although Eddie is generally okay with the idea, he's anxious about Martin discovering their long-term relationship, which has lasted eight years. Susan, however, feels it's time to share the truth and decides against returning to Martin’s apartment as planned. Martin struggles to see his sister as an adult capable of looking after herself, especially when it comes to the charming Eddie. This leads to a clash between Martin and Eddie, while Susan stands her ground, refusing to be treated like a child.