Question: Who is Busba Kitiyakara's paternal grandfather?

Context paragraphs:
title: Lyon Cohen
paragraph_text: Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist. He was the grandfather of singer/ poet Leonard Cohen.
title: Busba Kitiyakara
paragraph_text: " Than Phu Ying" Busba Kitiyakara Sathanapong( born 1934) was the daughter of Mom Chao Nakkhatra Mangala Kitiyakara and younger sister of Sirikit Kitiyakara, who became Queen of Thailand.
title: Kaya Alp
paragraph_text: Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
title: Fujiwara no Nagara
paragraph_text: , also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period. He was the grandfather of Emperor Yōzei.
title: Guillaume Wittouck
paragraph_text: Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate. He was the Grandfather of industrialist Paul Wittouck.
title: Thawisan Ladawan
paragraph_text: Thawisan Ladawan( 26 January 1923 – 7 April 2006) was husband of Busba Kitiyakara( younger sister of Queen Sirikit), a member of King Bhumibol Adulyadej's Privy Council, and for 26 years, principal private secretary to the King. Thawisan attended Vajiravudh College and graduated from the inaugural class of Faculty of Law, Thammasat University in 1938. After graduated, he worked in the Ministry of Foreign Affairs. He worked in several capitals, including Paris and Brussels, and earned a Diplome d' Etudes Superieures de Droit International Public from Paris University in 1954. He became Deputy Director- General of the Protocol Department before departing in 1968 to serve as Deputy Principal Private Secretary to King Bhumibol. A year later he became King Bhumibol's Principal Private Secretary, and was later appointed to the Privy Council. He died at the age of 83 due to chronic liver disease.
title: John Westley
paragraph_text: Rev. John Westley( 1636 – 78) was an English nonconformist minister. He was the grandfather of John Wesley( founder of Methodism).
title: Prithvipati Shah
paragraph_text: Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal. He was the grandfather of Nara Bhupal Shah.
title: Abd al-Muttalib
paragraph_text: Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
title: Nakkhatra Mangala
paragraph_text: Nakkhatra Mangala, Prince of Chanthaburi II (4 January 1897 – 11 February 1953), was the eldest son of Kitiyakara Voralaksana, Prince of Chanthaburi I and Princess Apsarasaman Kitiyakara. After his daughter Mom Rajawongse Sirikit Kitiyakara entered a royal marriage with King Bhumibol Adulyadej, he was promoted to General Prince of Chanthaburi Suranath, HH Prince Nakkhatra Mangala Kitiyakara in the past) by royal command in 1952. He represented the Ministry of Foreign Affairs as the ambassador of the kingdom of Thailand to the Court of St James's in the United Kingdom, and to the government of France Prince Nakkhatra married Mom Luang Bua Kitiyakara (Sanidvongs) and they had four children:

Reasoning steps:
Busba Kitiyakara father Nakkhatra Mangala
Nakkhatra Mangala father Kitiyakara Voralaksana

Answer: spans: Kitiyakara Voralaksana