Final answer:
While the student's question about the son of Hari Singh Nalwa does not yield a specific historical figure, it opens the discussion to the significant historical era where the Sikh Khalsa Fauj, with Nalwa as a leader, fiercely resisted Mughal domination.
Step-by-step explanation:
The son of Hari Singh Nalwa, the esteemed commander-in-chief of the Sikh Khalsa Fauj during the 18th century in the Sikh Empire, is not explicitly mentioned in the question. However, discussing Hari Singh Nalwa and the Sikh Khalsa Fauj relates to the broader historical context involving the Sikh resistance against Mughal authority, particularly during the reign of Aurangzeb.
Aurangzeb's reign included severe persecution and attempts to control the succession of Sikh gurus, sparking greater Sikh resistance. This historical period also saw the rise of the Sikh community as formidable warriors amidst continued clashes between Islamic rulers and the local Indian kingdoms. The establishment of the Sikh Empire in the 19th century, where Nalwa served, represented a significant shift in the power dynamics of the region, and the Sikh Khalsa Fauj played a vital role in defending and expanding the empire's territories.