Dhillon, Harish (2015). The Sikh Gurus. Hay House. ISBN9789384544454. Guru Nanak was about twenty-seven years old when he moved to Sultanpur. He had got married in the year 1487, and had been blessed with two sons. His father-in-law was Mulchand Khatri who lived in the town of Batala in Punjab. He had a daughter Sulakhni, who was said to be polite and soft-spoken. Both Jairam and Nanki had felt that she would make a good match for Nanak. It was during his stay at Sultanpur that his sons, Sri Chand and Lakhmi Das, were born, in the years 1494 and 1496 respectively. ... Ever since he had returned home from his journeys, Nanak knew that neither of his sons could be his successor - Sri Chand lived a life of renunciation while Lakhmi Das was too materialistic.
Singh, Bhupinder (October–December 2019). "Genealogy of Guru Nanak". Abstracts of Sikh Studies. 21 (4). Institute of Sikh Studies, Chandigarh. Archived from the original on 2023-06-02. Retrieved 2024-03-11.
Singh, Bhupinder (October 2019). "Genealogy of Guru Nanak". Abstracts of Sikh Studies. XXI (4). Archived from the original on 2023-06-02. Retrieved 2024-03-11.