Family matters also made Priestley's time in America difficult. His youngest son Harry died on December 11, 1795, probably of malaria. Mary Priestley died on September 17, 1796; she was already ill and never fully recovered after the shock of her son's death. On September 19 of that year Joseph wrote: "This day I bury my wife...she had taken much thought in planning the new house and now that it is far advanced and promises to be everything she wished, she is removed to another." After dinner on Monday 14 April 1800, various members of Priestley's household fell ill, with symptoms of food poisoning, which prompted the "Reading Advertiser" to falsely accuse Priestley's son William, of trying to poison them with arsenic.