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.
John Stuart Mill | House of Stuart | Stuart | Mary Stuart | J.E.B. Stuart | James Francis Edward Stuart | Stuart Raper | Stuart Highway | Charles Edward Stuart | Stuart Pearce | Leslie Stuart | Gilbert Stuart | Stuart Rendel, 1st Baron Rendel | Stuart Manning | Mary Stuart (play) | Mary Stuart Masterson | John Stuart, 3rd Earl of Bute | Stuart Whitman | Stuart McLean | Stuart Holland | Stuart Christie | Ricky Stuart | Marty Stuart | Henry Stuart, Lord Darnley | Stuart period | Stuart Kauffman | Stuart Blumberg | Stuart Bingham | Stuart Alexander Donaldson | Randy Stuart |
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.