John Lamont of that Ilk1 
Children of John Lamont of that Ilk and Helen Campbell
- Norman Lamont+2 d. 1834
- Maj.-Gen. John Lamont of that Ilk+2 b. 1774, d. 1827
Duncan Campbell of South Hall1
Child of Duncan Campbell of South Hall
- Helen Campbell+2 d. 1840
Helen Campbell1 
From 10 August 1773, her married name became Lamont.
Children of Helen Campbell and John Lamont of that Ilk
- Norman Lamont+2 d. 1834
- Maj.-Gen. John Lamont of that Ilk+2 b. 1774, d. 1827
Maj.-Gen. John Lamont of that Ilk1 
He rebuilt Ardlamont, sold Inneryne, and inherited Robroyston from his cousin Archibald.1 He held the office of Deputy Lieutenant (D.L.) of Bute.1 He gained the rank of Major-General.1
Children of Maj.-Gen. John Lamont of that Ilk and Rebecca Hobbs
- Amelia Helen Lamont1 d. 1840
- Augusta Charlotte Matilda Lamont1 d. 1830
- Georgina Lamont1 d. 1847
- Archibald James Lamont of that Ilk+2 b. 1818, d. 5 May 1862
George Hobbs of Barnaboy1
Child of George Hobbs of Barnaboy
Rebecca Hobbs1
From 1805, her married name became Lamont.
Children of Rebecca Hobbs and Maj.-Gen. John Lamont of that Ilk
- Amelia Helen Lamont1 d. 1840
- Augusta Charlotte Matilda Lamont1 d. 1830
- Georgina Lamont1 d. 1847
- Archibald James Lamont of that Ilk+2 b. 1818, d. 5 May 1862
Archibald James Lamont of that Ilk1 
He held the office of Deputy Lieutenant (D.L.) of Argyllshire.2 He held the office of Justice of the Peace (J.P.) for Argyllshire.2
Child of Archibald James Lamont of that Ilk and Adelaide Massy-Dawson
- Adelaide Augusta Lamont2 b. 1841
Children of Archibald James Lamont of that Ilk and Harriet Campbell
- Marion Alice Lamont2
- Evelyn Lamont2 b. 1848
- Amelia Georgina Adelaide Lamont2 b. 1849, d. 15 Mar 1884
- Major John Henry Lamont of that Ilk3 b. 10 Mar 1854, d. 1929
- Celestine Norman Lamont-Campbell, 3rd of Possil3 b. 14 May 1858, d. Jan 1893
George Leighton Seager, 1st Baron Leighton of Saint Mellons1 
George Leighton Seager, 1st Baron Leighton of Saint Mellons usually went by his middle name of Leighton.1 He was educated at Queen’s College, Taunton, Somerset, England.1 He gained the rank of officer in the Artists Rifles.1 He fought in the First World War, where he was invalided.1 He was appointed Commander, Order of the British Empire (C.B.E.) in 1932.1 He was partner of W H Seager & Company and Seager’s Shipping Supplies.1 He held the office of Justice of the Peace (J.P.) for Monmouthshire.1 He held the office of High Sheriff of Monmouthshire in 1938.1 He was appointed Knight in 1938.1 He was director of Tempus Shipping, Victory Shipping, Cardiff Channel Dry Dock, Barry Graving Dock, New Egypt and Levant Shipping Company, and Atlantic Shipping and Trading Company.1 He was created 1st Baronet Seager, of St. Mellons, co. Monmouth [U.K.] on 1 July 1952.1 He held the office of Vice-Lord-Lieutenant of Hampshire in 1957.1 He was created 1st Baron Leighton of Saint Mellons, of St. Mellons, co. Monmouth [U.K.] on 25 January 1962.1
Children of George Leighton Seager, 1st Baron Leighton of Saint Mellons and Marjorie Gimson
- John Leighton Seager, 2nd Baron Leighton of Saint Mellons+2 b. 11 Jan 1922, d. 1998
- Hon. Thelma Margaret Seager+2 b. 6 Nov 1923, d. 2017
- Hon. Douglas Leighton Seager+2 b. 24 Nov 1925, d. 14 Jul 2015
- Hon. Zoë Leighton Seager+2 b. 28 Apr 1928, d. 10 Aug 2019
Adelaide Massy-Dawson1 
From 1 September 1839, her married name became Lamont.
Child of Adelaide Massy-Dawson and Archibald James Lamont of that Ilk
- Adelaide Augusta Lamont1 b. 1841
Major John Henry Lamont of that Ilk1 
He gained the rank of Major in the 9th Lancers.1 In 1893 he sold Ardlamont and settled in Devon.1 He was recognised by Lord Lyon King of Arms, and matriculated his arms at the Lyons Court on 12 January 1909.1 He held the office of Justice of the Peace (J.P.) for Argyllshire.1 He held the office of Deputy Lieutenant (D.L.) of Argyllshire.1
