Louisa Clarke (nee Beake) was referred to in Charlie's diaries as 'Aunt Louisa'. She was the sister-in-law of Charlie's mother, Emily, having married Emily's eldest brother, George Leonard Clarke, at St Margaret's, Westminster on 25 April 1868. Louisa and her husband had at least three children, Fanny (born c. 1870), Leonard (born c. 1873) and William Clarke, who were Charlie's first cousins. References in Charlie's diary to 'Len' and to 'Cousin Will' are almost certainly to Louisa's two sons.
Louisa's husband George was an ornamental tile maker and fixer by occupation but also, together with Louisa, ran a Coffee House at 292 New North Road, Islington, where they lived. George died from cancer of the oesophagus on 2 November 1899 (aged 54). After his death, it appears (from 1901 census records) that Louisa converted the Coffee House business into a Dining Rooms.
Louisa was an important defence witness on 9 November 1877 at the Old Bailey trial of her father-in-law, Detective Chief Inspector George Clarke, and undoubtedly contributed to his acquittal.