Here is the info.
Bismillah Khan was born on March 21, 1916 in a family of professional shehnai players of a princely state Dumraon in Bihar.
He came to his maternal uncle Ustad Ustad Ali Bux, an eminent shehna player in Varanasi and at the tender age of six, started his practice in solitude on the banks of the Ganga and in the holy temples of Balaji, Jaru Mandir and Mangala Maiya etc.
Since his ancestors were all shehnai players including his great great grandfather late Ustad Salar Hussain Khan, great grand father late Ustad Husain Bux Khan, grand father late Rasool Bux Khan and father late Paighamber Bux Khan, Ustad Bismillah Khan carried forward his legacy of shehnai.
He gave his first public performance at the age of 14 in 1930 at an all India music conference in Allahabad.
He also played shehnai for the free nation from the ramparts of the Red Fort on August, 1947. Khan has also rendered shehnai in a famous movie Goonj Uthi Shehnai.
