In 1764 Oswald married Margaret Smythe (1747–1791), daughter of David Smythe of Methven. They had four sons and at least five daughters. •
Richard Alexander Oswald • David (died 1797 in the West Indies), major of the
38th Regiment • James, third son (died 1822), a naval captain •
Alexander Oswald (01 Apr 1777–12 Jul 1821), Advocate, married Miss Anne Dalrymple (who died 22 Jun 1820), youngest daughter of Sir Hew Dalrymple Hamilton of Bargany House • Elizabeth • Catherine or Katherine Cochrane, second daughter, married
Robert Haldane • Margaret, married Major General
John Wilson • Christian, married to the merchant Alexander Anderson • Mary Ramsay, married
James Dennistoun • Camilla, died 1808 • Isabella. ==Notes==