GURBAKHSH SIṄGH, BHĀĪ (d. 1764) , founder of the Bhāī family of Kaithal, was great-grandson of Bhāī Bhagatū of revered memory. His grandfather, Bhāī Bhagatū's elder son, Gaurā, was a brave warrior who became the chief of Viñjhū, near Baṭhiṇḍā. His father, Diāl Dās, on the other hand was known as a saint of wide sanctity. Gurbakhsh Siṅgh himself was an enterprising warrior. He developed friendship with Bābā Ālā Siṅgh, founder of the princely house of Paṭiālā, and together they made many conquests. In 1754, Bhāī Gurbakhsh Siṅgh led an expedition against Sardār Jodh Siṅgh of Baṭhiṇḍā, but finding his forces inadequate to reduce the territory he sought Ālā Siṅgh's help. The latter sent a considerable body of troops, but Jodh Siṅgh withstood the attack. Ālā Siṅgh summoned help from some of the trans-Sutlej Sikh sardārs. Jodh Siṅgh was defeated and his territories pillaged. The combined force retired leaving the Bhāī master of Baṭhiṇḍā and the surrounding district. Two years later Gurbakhsh Siṅgh joined Bābā Ālā Siṅgh in the latter's successful expedition against Ināyat Khān and Wilāyat Khān, Rājput chiefs of Buhāī and Bulodā. As a result Bhāī Gurbakhsh Siṅgh got possession of the district of Bulodā.

         After his death in 1764, the territories of Bhāī Gurbakhsh Siṅgh were divided among his five sons. His second son, Bhāī Desū Siṅgh, conquered Kaithal where he established himself as an independent ruler. One of his brothers, Buḍḍhā Siṅgh, seized a part of Thānesar which, however, he later lost to Bhaṅgā Siṅgh. Another brother Sukkhā Siṅgh established a separate branch of the family at Arnaulī, now in Haryāṇā. Other descendants of the family of Bhāī Gurbakhsh Siṅgh are living in and around Bhuchcho in Baṭhiṇḍā district.