In 1876, when her eldest daughter Margaret gave birth, she was reminded how difficult she had found the burden of motherhood. Inspired, Sumner publicized a meeting of mothers in the parish to offer mutual support. Her plan was quite radical in its day as it involved calling women of all social classes to support one another and to see motherhood as a profession as important as those of men, if not more so. The first meeting was held in Old Alresford Rectory, but Sumner was so overcome by nervousness that her husband had to speak for her and invite the women to return next week. At that second meeting she had gathered enough courage to lead her own meeting. The nascent Mothers' Union was limited to Sumner's parish. However, in 1885, she was part of the audience in the Portsmouth Church Congress, some 20 miles from her home. The first
Bishop of Newcastle,
Ernest Wilberforce, had been asked to address the women churchgoers. He felt that he had very little to say to women and invited Sumner to speak in his stead. Although nervous once again, she gave a passionate address about national morality and the importance of women's vocation as mothers to change the nation for the better. A number of the women present went back to their parishes to found mothers' meetings on Sumner's pattern. The Bishop of Winchester,
Edward Browne, made the Mothers' Union a diocesan organisation. The Mothers' Union concept spread rapidly to the dioceses of
Ely,
Exeter,
Hereford,
Lichfield and
Newcastle and then throughout the United Kingdom. By 1892, 60,000 members lived in 28 dioceses, and by the turn of the century, the Mothers' Union had grown to 169,000 members. Annual general meetings began in 1893, and the Mothers' Union Central Council was formed three years later. Sumner was unanimously elected president, a post she held into her nineties. In 1897, during her
Diamond Jubilee,
Queen Victoria became patron of the Mothers' Union, giving it an unprecedented stamp of approval. The Mothers' Union set up branches throughout the British Empire, beginning in New Zealand, then Canada and India. Sumner lived to lead the Mothers' Union to act in rebuilding the heart of Britain after the
First World War and saw the first Mothers' Union Conference of Overseas Workers in 1920. ==Death and legacy==