Andrew and Caroline's son, Ion (died 1929) and daughter Marian (died 1908), continued the work of their parents at the Newington Green Unitarian Church. The cause of liberal religion in general, and the development of the General Assembly of Unitarian and Free Christian Churches, were overarching themes. Ion was President of the Sunday School Association, one of the precursors to the General Assembly. Marian in particular is described as an unsung heroine, and "one of the leaders of modern Unitarianism". She set up Oxford Summer Schools for the training of Sunday School teachers, and Winifred House Invalid Children's Convalescent Home.