Last modified on Thu 14 Jan 2021 12.06 EST The bitter family feud over the billionaire Barclay brothers’ business empire remains headed for the high court in April, even as the once tight-knit family comes to grips with the death of Sir David, who together with his twin brother, Sir Frederick, amassed a £7bn fortune building the family firm. Last February Frederick, 86, and his daughter Amanda, 42, launched a legal action against David’s sons, Aidan, Howard and Alistair, and Aidan’s son Andrew after they were accused of secretly recording 1,000 conversations that Frederick held in the conservatory of the family-owned Ritz hotel in London.