The eldest child on the left is Eliza Louisa Marsh-Caldwell (1818-1913), known as ELouisa.  The youngest on the right is Mary Emma Marsh (later Lady Heath, 1826-1902).  The middle child is not named on the back but must be  Martin William James Marsh (1825-1846).

On the back of Elizabeth Louisa's is the inscription ‘14, ELouisa Marsh eldest child of AC & A Marsh, born 1818, aged 12’.  The youngest of the three is Mary Emma Lady Heath nee Marsh (1826-1902) and the inscription reads ’18, aged 4, Mary E Marsh 5^th daughter of AC & A Marsh, born 1826, married Sir L Heath RN’.  The hand writing is that of their mother Anne Marsh Caldwell. 

Anne Marsh Caldwell notes in one of her diaries the children being painted by Egley.

These miniatures would have been in the miniature collection owned by the Miss Marsh-Caldwells in the late 1800s.  

(Anne Marsh Caldwell)  (Arthur Cuthbert Marsh)