Macadam was the last in the family to have his name spelled in the various ways that Mac (son of) was spelled at the time as McAdam, M'Adam, but usually using both "MacAdam" and "Macadam", but the subsequent members of the family settled on the latter spelling.
William's two wives William's first wife was Rachel Gentle with whom he had one son, William. William's second wife was Helen Ann Stevenson (1803–1857). The wedding took place on 3 January 1825 at Cumbernauld. She died on 20 January 1857 at 6 Kelvinhaugh Street, Glasgow, and is buried with her husband in Glasgow Cathedral Old Burial Ground Glasgow. She was the daughter of William Stevenson of Park Farm, Clackmannan. and Helen Grindlay. with whom he had a further seven children.
His children •
William Macadam (1814 – circa 1877), was the first chemical scientist in the family, the eldest and a half-brother to his father's other younger children. •
Helen Grindlay Macadam (1825 – circa 1839) •
Dr John Macadam (1827–1865) emigrated to Australia, was a medical teacher, Australian politician and cabinet minister. After whom the genus
Macadamia (macadamia nut) was named. •
Stevenson Macadam (1829–1901) became a leading chemical scientist, analytical chemist and lecturer in
Edinburgh and was a founder of the
Institute of Chemistry of Great Britain (now the
Royal Society of Chemistry) and a founder of the
Society of Chemical Industry. •
Margaret Macadam (1831–1865) •
Charles Thomas Macadam (1832–1906) became senior partner in Odams, a fertiliser company, and was to hold the
Royal Warrant as Purveyor of Chemical Manures to
Queen Victoria and was a sponsor of the
1862 International Exhibition. •
George Robert Macadam (1837–1918), who followed his older brother John and emigrated to Australia where he became a teacher. •
Mary Elison Macadam (1835–1889) ==Residence==