Day Hort Macdowall was born on 27 March 1753.2 He was the son of William Macdowall, 18th of Garthland and 2nd of Castlesemple and Elizabeth 'Black Bess' Graham.3,4 He married Wilhelmina Graham, daughter of William Graham, 2nd of Airth and Ann Stirling, on 7 November 1791.2 He died on 16 June 1809 at age 56.2
He was in the Bengal Civil Service.2 He purchased Castlesemple.2 He lived at Walkinshaw, Renfrewshire, Scotland.2
Children of Day Hort Macdowall and Wilhelmina Graham
Anne Macdowall3 b. 10 Sep 1792, d. 1808
William Macdowall+5 b. 2 Sep 1793, d. 2 Apr 1836
James Macdowall3 b. 26 Jul 1794, d. 1827
Lt.-Gen. Day Hort Macdowall, 22nd of Garthland3 b. 3 Jul 1795, d. 14 Sep 1870
Henry Macdowall, 23rd of Garthland+3 b. 20 Nov 1796, d. 20 May 1882
George Graham Macdowall3 b. 1 May 1798, d. 1826
Elizabeth Macdowall+3 b. 29 Jan 1800, d. 7 Mar 1869
Mary Macdowall3 b. 3 Sep 1801, d. 17 Feb 1839
Hay Macdowall3 b. 6 Feb 1803, d. 23 Aug 1820
Wilhelmina Macdowall3 b. 14 Jul 1804, d. Sep 1830
Jemima Christian Macdowall+5 b. 14 Jan 1806, d. 19 Jul 1863
Thomas Macdowall3 b. 7 Jun 1807, d. 3 Apr 1810
Caroline Macdowall+3 b. 2 Dec 1808, d. 26 Jul 1849