Looking for descendants of Sir William Wellington Cairns(1828-1888).

  I'm looking for descendants of Sir William Wellington Cairns(1828-1888).Son of Capt.William Cairns & Matilda Beggs.Unmaried.His sibling:- i) Nathan Cairns. ii) Hugh McCalmont Cairns, 1st Earl Cairns,(1819-1885) married Mary Harriet McNeill.His issue:- ai) Hugh Cairns. aii) Arthur William Cairns,2nd Earl Cairns,(1861-1890) married Olivia Elizabeth BerensHis issue:- bi) Louise Rosemary Kathleen Virginia Cairns. aiii) Herbert John Cairns, 3rd Earl Cairns (1863 - 1905) aiv) Wilfred Dallas Cairns, 4th Earl Cairns (1865-1946) married Olive Cobbold.Hia issue:- bi) Hugh Wilfred John Cairns. bii) David Charles Cairns(1909-1989) married Barbara Jeanne Harrisson Burgess.His issue:- ci) Simon Dallas Cairns,6th Earl married Amanda Mary Heathcoat-Amory FitzGerald.His issue:- di) Hugh Sebastian Frederick Cairns married Juliet Frances Jean Palmer. dii) David Patrick Cairns married Francesca Lucy Rena. diii) Alistair Benedict Cairns married Anabella L Sim. cii) Andrew David Cairns married Cec