Kate was born in Dover in 1827 to Jacob Reuben, a clothier and Sarah Leah Lyon, both born in London. Kate was one of their four daughters who worked as assistants to their father.
In 1853 Kate married Samuel Aaron in Dover. He was a jeweller living in Torquay, where he had a Goldsmiths and Jewellers shop with his two brothers. Kate moved to Torquay and they had three children, Louisa born in 1854, Rachel in 1854, and Simeon Reuben Aaron born in Newton Abbot in 1868.
In May 1773 the family moved to Bath, when the Bath Chronicle advertised 'The shop no 6 Broad Street lately carried on by Helier and Lewis, is now opened by Aaron from Torquay'. Their daughter Louisa also advertised in June 1873 as a 'Professor of Piano Forte' and the paper carries many reports of her piano concerts at the Pump Room, commenting on her 'graceful expression and skilful execution'.
After her husband's death in 1881, Kate took on the lease at 6 Broad Street for the yearly rent of £50 ( just over £6,000 today) advertising as a Dealer in Antique Plate.
By 1889, Kate and her two daughters have moved to 28a Broad Street now listed in Kelly's Directory of Bath as a 'Fancy Repository'. The freehold for the property was sold in 1892 and from this we know that Kate was a subtenant leasing the shop and part of the large dwelling house of ten rooms, a kitchen, two WCs and offices, from Mr Press who lived and ran a confectionery business at the same address.
Kate died at 9 Stall Street, Bath in 1901, the cause given as 'apoplexy'. Her daughter Rachel Aaron was present at her death. Her death was notified in the Jewish Chronicle: 'At Bath on 9 October, Mrs Kate Aaron, widow of the late Mr Samuel Aaron, mother of S. R. Aaron and the Misses Aaron. Deeply mourned. God rest her soul. American papers please copy'.
Kate's husband Samuel, is buried at tombstone 42.