Flo is the ninth episode of season 3, and the twenty-ninth episode in the series overall. It originally aired in the United States on March 2, 2014.
Hannah learns that her maternal grandmother Flo is dying of pneumonia. While comforting her mother and aunts, she witnesses them squabble over petty matters. Hannah also unsuccessfully tries to bond with her uptight cousin, med school student Rebecca, and is forced to contemplate her future with Adam when her mother asks her to tell Flo that she is engaged to be married. Sadly, although Flo recovers from the pneumonia, she succumbs to a heart attack as soon as Hannah returns to New York.