Question: Ustad Barkat Ali Khan was the younger brother of what Hindustani classical vocalist, from the Kasur Patiala Gharana?

full_context: Document 1: Bade Ghulam Ali Khan: Bade Ghulam Ali Khan (Devanagari:बड़े ग़ुलाम अली ख़ान, Shahmukhi/Urdu: بڑے غلام علی خان) (c. 2 April 1902 – 25 April 1968) was a Hindustani classical vocalist, from the Kasur Patiala Gharana.
Document 2: Sukhawat Ali Khan: Sukhawat Ali Khan, son of Indian-Pakistani vocalist Ustad Salamat Ali Khan and nephew of Nazakat Ali Khan, is a classical singer of Sham Chaurasia gharana tradition, as well as a performer of North Indian and Pakistani classical music and related folk music. He began singing and playing the harmonium at age seven and has performed around the world. He currently lives in the San Francisco Bay Area where he performs in the world-fusion ensemble Shabaz (formerly the Ali Khan Band) with his sister Riffat Salamat and her husband Richard Michos.
Document 3: Farrukh Fateh Ali Khan: Farrukh Fateh Ali Khan (Urdu: ‎ ) (December 25, 1952 – September 9, 2003) was a player of the harmonium in Qawwali and also was a member of a well-known family of Qawwali musicians. He was the younger brother of Nusrat Fateh Ali Khan, the son of Fateh Ali Khan, the nephew of Mubarak Ali Khan, and the father of Rahat Fateh Ali Khan.
Document 4: Ali Akbar Khan: Ali Akbar Khan (14 April 192218 June 2009) was a Hindustani classical musician of the Maihar gharana, known for his virtuosity in playing the sarod. Trained as a classical musician and instrumentalist by his father, Allauddin Khan, Khan also composed several classical "ragas" and film scores. He established a music school in Calcutta in 1956, and the Ali Akbar College of Music in 1967, which moved with him to the USA and is now based in San Rafael, California, with a branch in Basel, Switzerland.
Document 5: Mazhar Ali Khan (singer): Ustad Mazhar Ali Khan is an Indian Classical and light classical vocalist of Kasur Patiala Gharana known for his performances of Khyal Thumeri dadra Geet Ghazals Folk Kafi
Document 6: Johar Ali Khan: Johar Ali Khan is a Classical Indian violinist. He is the son and disciple of the Late Ustad Gohar Ali Khan of Rampur, one of the greatest violin genius. He belongs to the Patiala Gharana of Rampur. He is the only living classical violinist from Patiala Gharana after his father - late Ustatd Gohar Ali Khan. His grandfather was Ustad Ali Baksh, the founder of Patiala Gharana, who has produced a number of great musicians like Bade Fateh Ali Khan, Amanat Ali Khan, Asad Amanat Ali Khan, and Hamid Ali Khan.
Document 7: Jawaad Ali Khan: Jawaad Ali Khan is a Hindustani classical vocalist of the Kasur Patiala Gharana.
Document 8: Hamid Ali Khan: Hamid Ali Khan (born 1953) is a Pakistani classical singer. He belongs to the Patiala gharana. Being a representative of the Patiala Gharana, Hamid Ali Khan is an exponent of ghazal and classical singing. He has released several records and performed with other famous Indian artists. He has also collaborated with many UK-based artists, some of the recent ones being Partha Sarathi Mukherjee (tabla) and Fida Hussain (harmonium).
Document 9: Fateh Ali Khan (Qawwali singer): Fateh Ali Khan (Urdu: فتح علی خان) was a classical singer and a Qawwali musician in the 1940s and 1950s. He was born in Jalandhar, Punjab, British India in 1901. Fateh Ali Khan was the father of Pakistani Qawwali musicians, Nusrat Fateh Ali Khan and Farrukh Fateh Ali Khan. Their family has an unbroken tradition of Qawwali, linked closely to the Sufi Chishti Order for over 600 years. Fateh Ali Khan was trained in classical music and Qawwali by his father, "Maula Baksh Khan", and he, soon after his training, distinguished himself as a skilled vocalist and instrumentalist. He learned to play traditional Indian instruments such as sitar, sarod and vichitraveena as well as Western instruments like the violin. He also mastered thousands of verses in Punjabi, Urdu, Arabic and Persian.
Document 10: Patiala gharana: The Patiala gharana is one of the "gharanas" of vocal Hindustani classical music. It was founded by Ustad Fateh Ali Khan and Ustad Ali Baksh Khan (known as Alia-fattu) and was initially sponsored by the Maharaja of Patiala, Punjab and was known for ghazal, thumri, and khyal styles of singing.
Document 11: Allauddin Khan: Allauddin Khan, also known as Baba Allauddin Khan (c. 1862 – 6 September 1972) was a sarod player and multi-instrumentalist, composer and one of the most renowned music teachers of the 20th century in Indian classical music.
Document 12: Munawar Ali Khan: Ustad Munawar Ali Khan (1930–1989) was an Indian classical and light classical vocalist of Kasur Patiala Gharana. He was the younger son of the maestro Ustad Bade Ghulam Ali Khan.
Document 13: Barkat Ali Khan: Ustad Barkat Ali Khan (1908 – 19 June 1963) was an Indian-Pakistani classical singer, younger brother of Bade Ghulam Ali Khan and elder brother of Mubarak Ali Khan, and belonged to the Patiala Gharana of music.
Document 14: Amjad Ali Khan (Indian vocalist): Amjad Ali Khan is an Indian classical singer and teacher of Kirana Gharana. He descends from the family lineage of Ustad Abdul Wahid Khan and Ustad Abdul Karim Khan, who are deemed as the founders of Kirana Gharana. He got education in music from his father Ustad Akhtar Nawaz Khan, and his maternal uncles Ustad Mashkoor Ali Khan and Ustad Mubarak Ali Khan, the primary masters of Kirana Gharana musical style.
Document 15: Raza Ali Khan: Ustad Raza Ali Khan (Devanagari:उस्ताद रज़ा अली खान) (born on 8 August 1962) is an Indian classical vocalist of the Kasur Patiala Gharana orchestra.
ground_truth: Bade Ghulam Ali Khan