Seton Montolieu Montgomerie was the second son of Archibald Montgomerie, 13th Earl of Eglinton (1812–1861) His mother was Theresa Newcomen, born in Calcutta. She died 1853. Theresa was the illegitimate daughter of Thomas Gleadowe-Newcomen, 2nd Viscount Newcomen. Seton may have been so named following his father being created Earl of Winton, a title previously held by the Seton family.
The Honorary Seton died in Windsor, at the age of 37, from the effects of diabetes. Adela, daughter of Arthur Capell, 6th Earl of Essex, in 1858. Seton had two half-sisters through this marriage:
Lady Sybil Amelia Montgomerie (d 3 February 1932)
Lady Hilda Rose Montgomerie (d 18 June 1928)
The couple had three children:
Alswen Dorothy Rose Montgomerie, died 23 December 1943
Viva Seton Montgomerie, born 1879 and died 14 April 1959
May Egida Montgomerie, born 4 April 1874 and died 2 December 1874
Viva wrote two books
The first one, published in 1914 was "Sunny Days on the Riviera.
The second book was "My Scrapbook of Memories", published in 1955 and containing references to Seton Montolieu Montgomerie, her mother and many Montgomerie family members.
