 Lascelles was knighted KCMG in 1886, promoted to GCMG in 1892, appointed GCB in 1897, and GCVO in 1904 following King Edward VII's meeting with Emperor Wilhelm II at Kiel.He was admitted to the Privy Council in 1894.In 1869 Lascelles married Mary Emma Olliffe (1845–1897), daughter of Sir Joseph Olliffe who was physician to the British Embassy in Paris.