He was the brother of Elizabeth (Gurney) Fry, a reformer, and Louisa Gurney Hoare, a writer on education, and also the brother-in-law — through his sister Hannah — of Thomas Fowell Buxton, an anti-slavery campaigner.
On 2 July 1811, Waller, as he was known, married Elinor Bell (of Wandle House, Wandsworth, London, who was first cousin to Elizabeth Fry, the famous prison reformer).
He noted the comparable apostolic deaconesses, as well as the Sisters of Charity (a Roman Catholic order founded by St. Vincent DePaul), the Mennonite nursing deaconesses in Holland, and Elizabeth Fry's work in England.
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The idea of prison reform was promoted in the early 19th century by Elizabeth Fry and her brother Joseph John Gurney.