Who is XXX's sister?
Aga Khan IV
Prince Shah Karim Al Hussaini, Aga Khan IV, KBE, CC (Persian: شاه کریم حسینی، آقاخان چهارم‎‎, Urdu: شاه کریم حسینی، آقاخان چهارم‎; Aga Khan is also transliterated as Aqa Khan and Agha Khan) was born on 13 December 1936, in Geneva, Switzerland.