Bhai Gurdas Singh ji was the eldest son of Giani Soorat Singh ji and were born in 1773. Like his father Bhai Sahib ji was a great scholar. Bhai Sahib ji became the Jathedar of Damdami Taksal after his father and continued the teaching of Gurbani Santhia and performing Katha at Sri Harmandir Sahib.
Bhai Sahib ji's son, Bhai Sher Singh became Shaheed fighting for the Khalsa Panth. Somebody asked them, "What is your emotional state after the Shaheedi of your son?" Bhai Sahib ji replied by quoting from Sri Guru Granth Sahib Ji:
As long as he is intoxicated with attachment to Maya,
the Righteous Judge - Dharam Raja shall punish him.
(Ang 278)