Peerage Record – 31343

     Julia Coster was the daughter of James Coster.² She married, firstly, Joseph Davies before 1854.¹ She married, secondly, William McMahon, son of Lt.-Gen. Sir Thomas McMahon, 2nd Bt. and Emily Anne Westropp, on 6 March 1854.¹ She died in 1874.¹
     From before 1854, her married name became Davies.¹ From 6 March 1854, her married name became McMahon.¹

     Vivian Massey McMahon was born on 2 November 1856.¹ He was the son of William McMahon and Julia Coster.² He died, without issue.¹

     Lt.-Col. Sir Kellerman Eyre McMahon, 6th Bt. was born on 24 August 1860.¹ He was the son of William McMahon and Julia Coster.² He married Lydia Mary Hoey, daughter of Major W. P. Hoey, on 8 June 1899.¹ He died on 10 September 1935 at age 75.¹
     He fought in the First World War.¹ He gained the rank of Lieutenant-Colonel in the 2nd Battalion, King’s Shropshire Light Infantry.¹ He was appointed Officer, Order of the British Empire (O.B.E.) in 1919.¹ He succeeded as the 6th Baronet McMahon [U.K., 1817] on 9 July 1932.¹

     Colonel Bernard William Lynedoch McMahon was born on 10 October 1865.¹ He was the son of William McMahon and Julia Coster.² He died on 23 December 1928 at age 63, unmarried.¹
     He gained the rank of Colonel in the Durham Light Infantry.¹ He was Equerry to HRH Princess Louise, Duchess of Argyll.¹ He was appointed Companion, Order of St. Michael and St. George (C.M.G.) in 1917.¹ He was appointed Commander, Royal Victorian Order (C.V.O.) in 1925.¹

     Lionel Westropp McMahon was born on 31 May 1868.¹ He was the son of William McMahon and Julia Coster.²
     He was educated at Wellington College, Crowthorne, Berkshire, England^G.¹

     Arthur Beresford McMahon was born on 20 September 1873.¹ He was the son of William McMahon and Julia Coster.² He married Annette Alice Turner, daughter of William C. Turner, in 1894.¹ He died on 30 March 1944 at age 70, without issue.¹
     He gained the rank of Lieutenant in the 4th Battalion, Bedfordshire Regiment.¹

     William C. Turner was in the Indian Civil Service.¹

     Annette Alice Turner was the daughter of William C. Turner.² She married Arthur Beresford McMahon, son of William McMahon and Julia Coster, in 1894.¹ She died on 3 June 1937.¹
     From 1894, her married name became McMahon.¹

     Emily Anne McMahon was the daughter of William McMahon and Julia Coster.² She died on 15 September 1864.¹

     Maude Geraldine McMahon was the daughter of William McMahon and Julia Coster.² She married Adrian Charles Chamier in 1882.¹ She died on 28 December 1913.¹
     From 1882, her married name became Chamier.