[2] Prithvi Singh Azad was born on 15 September 1892 at Lalru, a small town in Mohali district of the North Indian state of Punjab.

The couple had children, including a son, Ajit Singh Bhati, and a daughter, Dr. Pragya Kumar, who retired as chief medical officer at Panjab University, Chandigarh.

[3] According to the historian Ramachandra Guha, who makes the assertion in his book "Rebels against the Raj," Mirabehn, daughter of a British admiral and one of Mahatma Gandhi's closest disciples, was enamoured of Prithvi Singh Azad and infatuated with him for many years; she even wrote him a number of letters expressing her feelings.

Singh was attracted to the nationalist movement while he was still in his teens, and is reported to have been influenced by the arrest of Lokmanya Tilak and Khudi Ram Bose by the British government in 1907–08.

He visited the United States in 1912, where he met Lala Har Dayal, one of the founders of later-day Ghadar Party, a militant organization formed by Indians in North America for the liberation of India.

[13] A set of documents related his life has been preserved in Nehru Memorial Museum and Library, New Delhi as Baba Prithvi Singh Azad Papers.