In addition to Matthew Gregory Lewis, Matthew and Frances had three other children: Maria, Barrington, and Sophia Elizabeth. On 23 July 1781, when Matthew was six and his youngest sister one-and-a-half years old, Frances left her husband, taking the music master, Samuel Harrison, as her lover. During their estrangement, Frances lived under a different name, Langley, in order to hide her location from her husband, although he still learned of whereabouts. On 3 July 1782, Frances gave birth to a child. That same day, hearing of the birth, her estranged husband returned. Afterwards, he began to arrange a legal separation from his wife. After formally accusing his wife of adultery through the Consistory Court of the Bishop of London on 27 February 1783, he petitioned the House of Lords for permission to bring about a bill of divorce. However, as these bills were rarely granted, it was rejected when brought to a vote. Consequently, Matthew and Frances remained married until his death in 1818. Frances, though withdrawing from society and temporarily moving to France, was always supported financially by her husband and then later, her son. She later returned to London and then finished her life at Leatherhead, rejoining society and even becoming a lady-in-waiting to the Princess of Wales. Frances and her son remained quite close, with her taking on the responsibility of helping him with his literary career. She even became a published author, much to her son's dislike.