Ep 15. The Stinsons

In the How I Met Your Mother season 4 episode 15, titled "The Stinsons," the gang discovers that Barney has been lying to them all along about his family. They decide to pay him a surprise visit, only to find out that Barney's mother is, in fact, his aunt, and that his real family has been pretending to be the perfect family next door, the Stinsons.

As they spend time with the fake Stinsons, the gang begins to realize that they might not be as perfect as they seem. Lily is horrified to learn that the matriarch of the family, Loretta, is a heavy smoker, while Marshall discovers that the patriarch, Sam, has a disturbing love for guns. Meanwhile, Robin becomes inexplicably attracted to Barney's half-sister, Carly, much to his disgust.

As the evening wears on, tensions rise and secrets are revealed. The gang learns that the Stinsons are not the perfect family they appeared to be, but rather a dysfunctional group of people struggling to keep up appearances. Barney admits that he lied to them about his family because he was ashamed of them, but ultimately decides to embrace them for who they are.

"The Stinsons" is a funny and heartwarming episode that explores the idea of family and the importance of accepting people for who they are. Fans of the show will love the witty banter between the characters and the clever plot twists that keep them guessing until the end.