Bhai Sahib collected the Gurbani (Literally “Word of the Guru”) of Guru Gobind Singh Ji and compiled it in the form of Dasam Granth (Book of the Tenth Guru). … He also taught the reading of Gurbani and its philosophy to the Sikhs.

List of Bhai Mani Singh’s sons:
Chitar Singh, killed with Mani Singh in Lahore in 1734.
Bachitar Singh, killed in the battle of Nihan near Anandpur Sahib in 1704.
Udai Singh, killed in Sahi Tibi near Anandpur Sahib in 1704.
Anaik Singh, killed in the battle of Chamkaur in 1704.
Ajab Singh, killed in the battle of Chamkaur in 1704.
Ajaib Singh, killed in the battle of Chamkaur in 1704.
Gurbaksh Singh, killed with Mani Singh in Lahore in 1734.
Bhagwan Singh
Balram Singh
Desa Singh – the author of the Rahetnama (Code of conduct) of the Khalsa.

Seven of Mani Singh’s sons were from his first wife, Seeto Bai Ji and the remainder from his second wife Khemi Bai Ji .

Bhai Mani Singh – Wikipedia

https://en.wikipedia.org/wiki/Bhai_Mani_Singh

The book referred to by Bhai Pinderpal – Shahid Bilas
https://archive.org/details/ShahidBilasBhaiManiSinghEd.GianiGarjaSingh

Summary in English – Shaid Bilas
https://www.thesikhencyclopedia.com/scriptures/nineteenth-century-literature/shahid-bilas-bhai-mani-singh