It can be sisters, brothers or brother(s) and sister(s) but the title has to be WIM (female) / FM (male) or rating 2200+ (female) / 2300+ (male) and above.

GM Susan, IM Sofia and GM Judit Polgar (sisters)
GM Lajos and IM Ferenc Portisch (brothers)
GM Robert and IM Donald Byrne (brothers)
GM Jozsef and GM Csaba Horvath (brothers)
GM-elect GB Prakash and GM RB Ramesh
IM Dan and GM Pia Cramling (brother and sister)
IM Nadezhda and IM Tatiana Kosintseva (sisters)
GM Shakhriyar Mamedyarov and WIM Turkan Mamedjarova (brother and sister)

GM Nicholas and IM Richard Pert (identical twins!)
IM Adam and IM Harriet Hunt (brother and sister)
IM Miroslav and WGM Jovanka Houska (brother and sister)
GM Simen and FM Espen Agdestein (brothers)
GM Kjetil and FM Espen Lie (brothrers)

IM Eugene and FM John Meyer (brothers)
IM Greg and WGM Jennifer Shahade (brother and sister)
IM Alisa and WGM Mirjana Maric (sisters)
IM Aljosa and WIM Kiti Grosar (brother and sister)
WGM Anita and WGM Ticia Gara (sisters)
WGM Anna and WIM Mariya Muzychuk (sisters)
IM Miklos and FM Janos Orso (brothers)

IM Vijayalaxmi and WGM Meenakshi (sisters)
GM Humpy and Chandra Hawsa Koneru (sisters)
WIM Rohini, WIM Jayashri and WIM Vasanti Khadilkar (sisters)
GM Abhijeet and WIM Mrunalini Kunte (brother and sister)

IM Jay and FM Paul Whitehead
IM Richard and FM Thomas Costigan
IM Chandrashekhar and Jayant Gokhale (brothers)
WIM Lorena and WFM Sonia Zepeda (sisters)

Can you name some of the other formidable chess playing siblings?
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Chess Daily News from Susan Polgar
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