Jacob's wife was related to James Lawrence, a naval officer in the War of 1812.

The family are said to be descended from Adam Mott from Essex, England, who arrived in the United States before 1647.

He followed his father as President of the foundry business and was described at his death as "for many years a notable figure in the life of the city".

[1] His son Jordan Lawrence Mott III (born 13 May 1857 – 7 January 1932)[2] married Katherine Jerome Purdy.

[4] The picture is now owned by the Cooper Union, with a copy by John Sartain in the American National Portrait Gallery.