Seton Montolieu Montgomerie

[2] Lady Theresa died in December 1853 and Seton's father remarried in 1858, his new wife being Lady Adela Caroline Harriet Capell (1828–1860), daughter of Arthur Capell, 6th Earl of Essex.

His older brother was Archibald Montgomerie, who became the 14th Earl of Eglinton (3 December 1841 – 30 August 1892).

Seton had the rank of Lieutenant in the service of the Scots Fusilier Guards and married Nina Janet Bronwen Peers Williams, daughter of Lt.-Col. Thomas Peers Williams, on 11 June 1870.

Seton and Bronwen had three children:[5] His daughter Viva wrote two books; the first, published in 1914, was 'Sunny Days on the Riviera.

Being a Diary of Some Sketching at Eze', illustrated with views of the Riviera by her sister Alswen.