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

Context paragraphs:
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.

Jawaad Ali Khan: Jawaad Ali Khan is a Hindustani classical vocalist of the Kasur Patiala Gharana.

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.

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.

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.

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.

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.

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.

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

Ka Karoon Sajni Aaye Na Baalam: Ka Karoon Sajni Aye Na Baalam is a classical song of Hindustani classical music.  It is a Thumri sung in the raaga, Sindh Bhairavi Thumri.  It was popularised by legendary Hindustani vocalist, Bade Ghulam Ali Khan, Barkat Ali Khan, Bismillah Khan on shehnai, Pandit Ajoy Chakrabarty etc.

Supporting paragraphs: Barkat Ali Khan Bade Ghulam Ali Khan
Answer: Bade Ghulam Ali Khan