Joshua Hargrave Sams Mann was the son of Mary E. and James Hargrave Mann (d.1869) a floor-cloth and varnish manufacturer.
J.H.S. Mann married Katharine Marion Williams, daughter of James Degnum Williams, on 21 February 1860 at St Mary, Putney. By the 1871 census they had three sons, James H., Horace and Frederick, and a daughter, Katherine (aged 10, 8, 7 and 5 respectively).
At the time of his death on 2 March 1886, J.H.S. Mann was living in the Parish of St Pancras, and probate of his estate of £2786.16.6 was granted on 15 April 1886 to his son Frederick, sole executor.
J.H.S. Mann was an artist, painter of figures and genre subjects including The Cauld Blast (1876, Royal Holloway), and Head of a girl, looking upwards (Watford Museum).
Margaret F. MacDonald, Grischka Petri, Meg Hausberg, and Joanna Meacock, James McNeill Whistler: The Etchings, a catalogue raisonné, University of Glasgow, 2012, online website .
London Metropolitan Archives (L.M.A.), St James, Clerkenwell, Day book of baptisms, P76/JS1, item 25. UK census 1871.
L.M.A., St Mary, Putney, Register of marriages, P95/MRY1, item 386, and England & Wales, National Probate Calendar (Index of Wills &c), 1861-1941, ancestry.co.uk.