There is a total of 21191 clues beginning with si
- Sister of Beezus
- Sister of Bert Bobbsey
- Sister of Beth and Amy
- Sister of Beth, Jo and Amy
- Sister of Boris Godunov
- Sister of Cadmus
- Sister of Caesar
- Sister of Caligula
- Sister of Calliope
- Sister of Calliope
- Sister of Carmela Ponselle
- Sister of Cartoon Network
- Sister of Castor
- Sister of Castor and Pollux
- Sister of Castor and Pollux
- Sister of Cécile, Yvonne, Annette, and Marie
- Sister of Charles
- Sister of Charles and Andrew
- Sister of Charles and Andrew
- Sister of Charles, Andrew and Edward
- Sister of Charles, Andrew and Edward
- Sister of Charles
- Sister of Charlotte
- Sister of Charlotte and Emily
- Sister of Chekhov's Irina and Masha
- Sister of Chekhov's Irina and Olga
- Sister of Chekhov's Maria and Irina
- Sister of Chekhov's Masha and Irina
- Sister of Cleopatra
- Sister of Clio
- Sister of Clio and Calliope
- Sister of Clio and Terpsichore
- Sister of Clio
- Sister of Clotho
- Sister of Cordelia
- Sister of Cronus
- Sister of David and Patricia
- Sister of Dick, in primers
- Sister of Dido
- Sister of Dubya
- Sister of Duke Godfrey in "Lohengrin"
- Sister of Dweezil, Ahmet and Diva
- Sister of Emily
- Sister of Emily and Charlotte
- Sister of Eos
- Sister of Eos and Helios
- Sister of Erato
- Sister of Erato or Clio
- Sister of Euterpe
- Sister of Euterpe
- Sister of Eva
- Sister of Eva and Magda
- Sister of Eva and Zsa Zsa
- Sister of ex-King Carol
- Sister of Fatima
- Sister of Fenrir the wolf
- Sister of fiction
- Sister of Fortune?
- Sister of Frank Jr
- Sister of Fred
- Sister of Fred Astaire
- Sister of Fred Astaire
- Sister of Goneril
- Sister of Goneril and Cordelia
- Sister of Hades
- Sister of Hammie and Wren in the comic strip "Baby Blues"
- Sister of Hansel
- Sister of He-Man
- Sister of Helios
- Sister of Helios and Selene
- Sister of Helios and Selene, in myth
- Sister of Helios
- Sister of Herod Agrippa II
- Sister of Iphigenia
- Sister of Irina and Masha
- Sister of Iris
- Sister of Isabel II
- Sister of Jack and Bobby
- Sister of Janet
- Sister of Janet Jackson
- Sister of Jimmy Carter
- Sister of Jo, in literature
- Sister of Jo, Meg and Beth
- Sister of Jo, Meg, and Amy
- Sister of John and Lionel
- Sister of John Boy
- Sister of John Foster Dulles
- Sister of John-Boy Walton
- Sister of Joseph II
- Sister of Julius Caesar
- Sister of Jupiter
- Sister of Katharina, the Shrew
- Sister of Khloé
- Sister of King Arthur
- Sister of King Charles III
- Sister of La Toya
- Sister of Lachesis
- Sister of Laertes
- Sister of Laertes, in "Hamlet"
- Sister of Laertes