Certain families, such as the Cecils, owe their long-standing political influence to the composition and role of the House of Lords, which was still mainly composed of hereditary legislators until the passing of the House of Lords Act 1999.
Many such families were part of the landed gentry, who often exerted political control in a certain locality over many generations.
Additionally, Arthur Guinness' great-grandson of the same name (through the former's son Hosea) was a politician in a different country: Speaker of the New Zealand House of Representatives.
All of the Longs in this list are related to each other, sharing a common ancestor.
Eddie McAteer, one-time leader of the Nationalist Party, was the brother of Hugh McAteer, a Sinn Féin and IRA activist, and the father of Fergus McAteer, a leader of the Irish Independence Party Robert Overend, Vanguard Unionist member of the Northern Ireland Constitutional Convention Three prominent political dynasties of the 18th, 19th and 20th centuries, interrelated through several marriages.