 His great-grandfather and 2nd-great-grandfather had also been members of the Council.His brothers included Admiral Edmund Lyons, 1st Baron Lyons (1790–1858); Lieutenant Maine Walrond Lyons (1798–1827), a lieutenant in the navy who was killed at Battle of Navarino; and Humphrey Lyons (1802–1873), a lieutenant-general in the Indian (Bombay) Army.His nephews included the diplomat Richard Lyons, 1st Viscount Lyons (1817–1887); Sir Algernon McLennan Lyons, Admiral of the Fleet (1833–1908); and Richard Lyons Pearson, Assistant Commissioner of the Metropolitan Police (1831–1890).