Thomas Sutcliffe Mort died in May 1878 at his home on the South Coast of New South Wales, Comerang House, Bodalla. By his will, dated 28 February 1878, he left his property to his wife and children, in trust for those under the age of 24. The Will appointed as Trustees his wife, Marianne Elizabeth Mort, his eldest son, James Laidley Mort and T. S. Mort's friends Benjamin Buchanan, Lesley G. Herring and Charles James Manning. Laidley Mort later renounced his Trusteeship. Marianne Elizabeth Mort continued to take an active interest in the affairs of the Estate for many years. She died on 7 October 1909.