MUL CHAND, BHAI father in law of Guru Nanak, was a Chona Khatri, resident of Batala, who looked after the lands of the Randhava Jatts of the village of Pakkhokc in present day Gurdaspur district of the Punjab. He had a daughter of marriageable age named Sulakkhani whom he betrothed to (Guru) Nanak, then working as a modi or storeholder for the Nawab of Sultanpur Lodhi.

The match was arranged through Bhai Jai Ram, husband of the Guru`s sister, Bibi Nanaki, and the marriage was solemnized at Batala on 24 September 1487. Gurdwara Dehra Sahib, also known as Viah Asthan Guru Nanak DevJi, now marks the place where Bhai Mul Chand lived. The family later shifted to Pakkhoke Randhave where Mata Sulakkhani came with her two sons to put up with her parents during Guru Nanak`s absence from home. She rejoined him at Kartarpur, opposite Pakkhoke across the River Ravi, where he had settled after his prolonged peregrinations.

References :

1. Santokh Singh, Bhai, Sri Gur Pratap Suraj Granth. Amritsar, 1927-35
2. Gian Singh, Giani, Twarikh Guru Khalsa [Reprint]. Patiala, 1970
3. Macauliffc, M.A., The Sikh Religion. Oxford, 1909
4. Harbans Singh, Guru Nanak and the Origins of Sikh Faith. Delhi, 1969
5. McLeod, W.IL, Guru Nanak and the Sikh Religion. Oxford, 1968