S1·E50 Susi at Kandado (Key and Chain)

After working hard for ten long years to ensure his family's future Mariano comes home from America with a terrible secret: he has contracted AIDS abroad. Soon his family finds out about his illness, and his sister Mila, whom he has sent to school and has become a successful doctor, decides to keep him under lock and key-isolated like some banished leper in his own home.