Mary Hogarth Dickens' first child was named Mary in her memory. Hogarth was the daughter of George Hogarth (1783–1870), a music critic, cellist and composer, and Georgina Hogarth Thompson (1793–1863). She was born in Edinburgh, where her father was a legal advisor to Walter Scott, whom the young Charles Dickens greatly admired. She was the fourth of ten children, and the third daughter. Hogarth was named after her paternal grandmother. The name Mary Scott had previously been given to George and Georgina's third child, born 1817 or 1818, who was an infant when she died. Mary and her sister Catherine first met
William Hogarth seen faces and necks, hands and arms in living women, that even the Grecian Venus doth but coarsely imitate." On 23 March 1729 Hogarth married Jane Thornhill, daughter of artist Sir James Thornhill. Hogarth was initiated as a Freemason before 1728 in the Lodge at the Hand and Apple Tree Tavern, Little Queen Street, and later belonged to the Carrier Stone Lodge and the Grand Stewards' Lodge; the latter still possesses the 'Hogarth Jewel' which Hogarth designed for the Lodge's Master to wear. Today the original is in storage and a replica is worn by the Master of the Lodge.