Lelia's first husband was Industralist and Shipbuilder William Denny of William Denny & Sons who operated the most important yard on the Leven from 1844 to 1963. Always innovators they were responsible for a number of firsts: in 1878 the Rotomahana was the first all steel merchant ship; 1901 the King Edward was the world's first commercial turbine steamer; in 1934 the Robert the Bruce, a car ferry on the Firth of Forth, was the first all welded vessel as well as the first diesel-electric paddle. Their ship model experiment tank, (1883) was instrumental in enabling Dennys' to establish a reputation as specialist builders of fast cross-Channel steamers.

After the death of her first husband Lelia married The Rt. Hon. Sir Bernhardt Samuelson, becoming step-mother to Sir H.B. Samuelson. He was a British ironmaster and promoter of technical education. Samuelson had been born in Hamburg and taken by his father, a merchant, to Hull in England's northeast soon afterwards. By the 1840s he had become a merchant engaged in selling British locomotives and engines in Europe and had acquired considerable engineering knowledge. From 1848 Samuelson was an agricultural implements manufacturer and, after 1853, an ironmaster at Middlesbrough, also in England's northeast. By the end of the 19th century he was one of the largest ironmasters in Britain, and one of the few Jewish entrepreneurs in Britain directly engaged in running a successful heavy industry. Samuelson served as a Liberal member of Parliament in 1859 and from 1865 to 1895. In Parliament he served on many committees and commissions concerned with technical education and did much to advance it in Britain. He was made a baronet (a hereditary knight) in 1884.
https://www.jewishvirtuallibrary.org/samuelson-sir-bernhard