His parents were Jean Baptiste Jadot (1839–1887), an entrepreneur and merchant who became mayor of On-lez-Jemelle, and Marie Elise Cousin (1841–1922).

[1] His brother, Jean Jadot (1862–1932) was an engineer and pioneer of railway construction in China, Egypt and the Belgian Congo.

[5] Émile Francqui returned to China in 1901 to negotiate resumption of the Kaiping coal mines for his Compagnie Internationale d'Orient.

In April 1904 Lambert Jadot became general manager of the company created to operate the Tianjin tramway concession, and began the construction work, which was completed in 1906.

[9] In 1916 he founded and became first president of the Association des intérêts coloniaux belges (AICB), a lobby group for private enterprises in the Congo.

[11] In 1921 the minister Louis Franck obtained permission from parliament to start work on a one-stop rail / river link running northwest from Bukama to Léopoldville, the project that Lambert's cousin Odon Jadot had abandoned in 1914.

[14] Diamant Boart, a subsidiary of Union Minière du Haut-Katanga, was founded on 3 February 1937 to manufacture diamond-tipped grinding machines, chaired by Lambert Jadot.

[citation needed] Their son Jean Jadot (born 1909) became director of the Pontifical Mission Societies.

It was a comfortable, fairly new house in the neo-Louis XV style, with pediment and stone tympanum, with a stable, saddlery and greenhouses.