The three peers, in order of when they received their title, are: The original Sainsbury's Supermarkets founder, John James Sainsbury, never officially received or held any Queen's honours.
He was the first member of the Sainsbury family to be raised to the peerage, and chose the territorial designation of Drury Lane in his title, as Sainsbury's first shop was opened there in 1869.
Alan Sainsbury initially took the Labour whip in the House of Lords, and died on 21 October 1998.
John, Lord Sainsbury was a member of the fourth generation of the Sainsbury family, who received his peerage on 31 July 1989 and chose the territorial designation of Preston Candover, where he lived.
David Sainsbury, also of the fourth generation, received his peerage on 3 October 1997, and chose the territorial designation of Turville, which is where he lives.