Who is XXX's sister?
Dibyalangkarn
Her Royal Highness Princess Dibyalangkarn or Phra Chao Boromwongse Ther Phra Ong Chao Dibyalangkarn (RTGS: Thipphayalangkan) (Thai: พระเจ้าบรมวงศ์เธอ พระองค์เจ้าทิพยาลังการ) (17 January 1891 -- 4 June 1932), was the Princess of Siam (later Thailand. She was a member of Siamese Royal Family. She is a daughter of Chulalongkorn, King Rama V of Siam. Her mother was The Noble Consort (Chao Chom Manda) Sae Rojanadis, daughter of Phraya Abbhantrikamas and Bang Rojanadis. She had 2 siblings; elder brother and elder sister; Prince Khajera Chirapradidha (23 July 1888 -- 7 October 1888) Princess Abbhantripaja (31 October 1889 -- 18 February 1934) Princess Dibyalangkarn died on 4 June 1932, at the age of 41.
Abbhantripaja