His father was a foreign correspondent for The Times, and he is a great-grandson of civil engineer Sir Alexander Meadows Rendel, and a great-great-nephew of Liberal MP Stuart Rendel.
From 1768 the Sumner family owned the Hatchlands estate until it went to auction in 1888 and was bought by Lord Rendel.
In 1899 he married Grace Daphne Rendel, daughter of Lord Rendel, former Liberal MP for Montgomeryshire.
His mother was Rose Ellen Rendel, the daughter of Stuart Rendel, 1st Baron Rendel, from whom he inherited a substantial estate.
Hatchlands Park was passed to the National Trust by a grandson of Lord Rendel and is open to the public, but closed in the winter months.
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In 1888, the Sumner family sold the estate to Stuart, later Stuart Rendel, 1st Baron Rendel.
Baron | Louis Mountbatten, 1st Earl Mountbatten of Burma | Horatio Nelson, 1st Viscount Nelson | Herbert Kitchener, 1st Earl Kitchener | John Stuart Mill | House of Stuart | Stuart | Charles Cornwallis, 1st Marquess Cornwallis | 1st United States Congress | Frederick Roberts, 1st Earl Roberts | Bernard Montgomery, 1st Viscount Montgomery of Alamein | William Cecil, 1st Baron Burghley | Robert Harley, 1st Earl of Oxford and Earl Mortimer | George Villiers, 1st Duke of Buckingham | Thomas Wentworth, 1st Earl of Strafford | baron | William Pitt, 1st Earl of Chatham | Mary Stuart | Sacha Baron Cohen | J.E.B. Stuart | James Francis Edward Stuart | Joseph Lister, 1st Baron Lister | Joey Baron | Robert Baden-Powell, 1st Baron Baden-Powell | John Scott, 1st Earl of Eldon | Henry Brougham, 1st Baron Brougham and Vaux | Edward Seymour, 1st Duke of Somerset | Robert, 1st Earl of Gloucester | Guy Carleton, 1st Baron Dorchester | Garnet Wolseley, 1st Viscount Wolseley |
From 1894 he was elected Liberal Member of Parliament for Montgomeryshire in a by-election to succeed Stuart Rendel on his elevation to the peerage.