After selling his Wythenshawe estate to Manchester Corporation in 1926 Robert and his family moved first to Wybunbury in Cheshire and then to Kent, where Robert died the day before his 79th birthday. He had two older sisters: Alice (1877–1929) and Eva Beatrice (born 1879). After completing his education Robert enlisted in the Oxfordshire and Buckinghamshire Light Infantry and rose to the rank of Captain.
The couple had four children: William Grey Maurice (born 1912), Betty Catherine (born 1914), Susan, and Christopher (born 1922).
Manchester Corporation had been trying to buy the estate for some time, to develop much-needed housing for the city"s rapidly expanding population, but Thomas had refused to sell. In 1926 Robert bowed to the inevitable and sold 2,500 acres (1,000 ha) of land to the corporation.
He also sold Wythenshawe Hall and 250 acres (100 ha) of its surrounding parkland to Ernest Simon, who donated them to Manchester Corporation "to be used solely for the public good". After leaving Wythenshawe Hall Robert and his family moved to Wybunbury, in the south of Cheshire.
Shortly after the family home had been sold, Robert"s eldest son, William Grey, died at school at Eton, aged 14.
After the war the family moved to Kent, where Robert died on 1 March 1962, the last of the male line of his family.
He was the last member of his family to own Wythenshawe Hall and its estate, the ancestral home of the Tattons for 600 years, and the last male member of his line.