Elizabeth Holmes (nee Hackworth) was born at 3 am on 13 July 1818 at Warbottle. She was the daughter of Timothy Hackworth and Jane Hackworth (nee Golightly). She moved to Shildon in 1825 when her father gained employment with the Stockton and Darlington Railway Company. Elizabeth married Benjamin Holmes, a linen merchant (born in 1816 and died in 1847) on 8 November 1837 at St John’s Church, Shildon. They had three daughters and one son, the eldest daughter, Jane Elizabeth Holmes, died in 1863 aged 24, Mary, known as Minnie often experienced poor health and it is not known when she died. Another daughter, Ann, died of alcoholism on 5 December 1898. Elizabeth's son was Samuel Holmes, whose papers are listed in series HACK 6/2. Benjamin Holmes died on 5 January 1847 of tuberculosis and family moved from their home in Leeds back to Soho house, Shildon. Elizabeth did not remarry and died on 26 May 1905, aged 86 years.

Prudence Nightingale (nee Hackworth) was born at 10.30 am on 28 June 1822 at Warbottle. She was the daughter of Timothy Hackworth and Jane Hackworth (nee Golightly). She moved to Shildon in 1825 when her father gained employment with the Stockton and Darlington Railway Company. Prudence set up a school or ‘Seminary for Young Ladies’ in Penrith; all of her sisters either taught at or were taught there. She was responsible for sending her sister Jane Young (nee Hackworth) to school in Vilvorde, Belgium. She married a widow. Charles Nightingale (born in 1816 and died in 1904), a Methodist Minister at the Wesleyan Methodist Chapel in Darlington 17 August 1858. Because Charles was a minister it is likely that the family moved location every three years. Correspondence created and received by Prudence is evidence that she was active in family affairs. After her father died Prudence was active in settling his estate. At the time the estate was winding up she left her school and rented a farm at Heighington, where her brother Timothy Hackworth, son of Timothy Hackworth also lived until his death in 1856 aged 31. Prudence was active in trying to gain recognition for her father and was in correspondence with individuals interested in his life and work. She was involved in sending Hackworth material to the Baltimore and Ohio Railway exhibit in the World Columbian Exposition, America. She also investigated when there was a possibility that the ‘’blast pipe letter’’ had been misplaced and displayed in an exhibition in London. She died in 1897

Timothy Hackworth (1825-1856) was the son of Timothy Hackworth (1786-1850) and Jane Hackworth (nee Golightly) and was born on 27 February 1825. He had a twin, Thomas, who died at six weeks old. He assisted his father with the business, and after his father died he continued to work at Soho Works. In January 1851 he applied for a mortgage to enable the business to continue and concentrated on building stationary engine at Soho. When the estate was being settled he offered to buy the works but his offer was rejected and the works eventually sold in 1855. By this time, Timothy had become very unwell with diabetes and had gone to live with his sister Prudence Nightingale, he died 2 May 1856.

George Edward Young was born in 1823 and was the only son of Robert Young, who had worked with Timothy Hackworth at Wylam Colliery. Robert Young came to work for the Stockton and Darlington Railway at the same time as Timothy Hackworth and was an engineman at Brusselton Incline. George Edward Young was an office boy at Soho Works and worked his way up to be office manager. He later became a Wesleyan Methodist Preacher and was Methodist Minister in Leeds from 1868 – 1874 and from 1877 – 1880. He married Jane Hackworth on 28 December 1853, he couple moved around regularly due to George Edward’s job; correspondence shows that they lived in Leeds, London and that Jane lived in Hull. George Edward and Jane had five sons and one daughter, their sons included the following that feature in the archive Timothy Hackworth Young, Robert Young, George Edward Young and Samuel Holmes Young. Both Jane and George Edward Young were active in campaigning for recognition of Timothy Hackworth. George Edward Young’s research papers and correspondence demonstrate his involvement in the cause. He died in 1889.

Jane Young (nee Hackworth) was born at 4 pm on 19 June 1831 at Soho House, Shildon. She was the daughter of Timothy Hackworth and Jane Hackworth (nee Golightly). She went to school at her sister Prudence Nightingale (nee Hackworth)’s Seminary for Young Ladies in Penrith and then was sent to finish her education in Vilvorde, Brussels. She married George Edward Young, a Wesleyan Preacher on 28 December 1853. The couple moved around regularly due to George Edward’s job; correspondence shows that they lived in Leeds, London and that Jane lived in Hull. They had five sons and one daughter, sons including the following that feature in the archive: Timothy Hackworth Young, Robert Young, George Edward Young and Samuel Holmes Young. Both Jane and George Edward Young were active in campaigning for recognition of Timothy Hackworth. George Edward Young’s research papers and correspondence demonstrate his involvement and Jane Young (nee Hackworth) appears to have been involved in research about her father for most of her life. She died in 1914.