Bhai Sahib was born on 10th August 1944 at village Bahuliana, Tehsil Chunni in district Lahore. He did his schooling in Abohar and then Giani in 1972 from Punjabi University, Patiala. Bhai Sewa Singh's native village is Tarmala in district Mukatsar, Punjab. In his early childhood he was inspired to imbibe Gurmat by his father S. Kundan Singh and mother Mata Ishar Kaur.
In 1978, he took Baptism "Amrit" at the inspiring persuasion of his close associate, Bhai Inderjit Singh Narangwal