Hi Shonagh,
Glad to be able to make your dad happy.
Had a look and found Minnie Dent in the 1871 census living at 1 Radley Row, Wellgate, Rotherham.
 Thomas Dent 46  Louth, Lincolnshire, England Head  Rotherham  Yorkshire   occupation Tailor
Elizabeth Dent 45  Rotherham, Yorkshire, England Wife  Rotherham  Yorkshire   occupation Dressmaker
 Joseph Dent 20  Rotherham, Yorkshire, England Son  Rotherham  Yorkshire   occupation Plumber
Hannah M Dent 15  Rotherham, Yorkshire, England Daughter  Rotherham  Yorkshire   occupation works at a sewing machine
 
 Minnie Dent 6  Rotherham, Yorkshire, England Daughter  Rotherham  Yorkshire   Scholar
And here she is in the 1881 census living at 111 Wellgate Rotherham.
 Thomas Dent abt 1825  Louth, Lincoln, England Head  Rotherham   
Elizabeth Dent abt 1826  Rotherham, Yorkshire, England Wife  Rotherham   
William J. Dent abt 1846  Rotherham, Yorkshire, England Son  Rotherham   Widow
 Mary E. Dent abt 1870  Brom Weston, Yorkshire, England Granddaughter  Rotherham   
 Minnie Dent abt 1865  Rotherham, Yorkshire, England Daughter  Rotherham   occupation Gen servant
Wendy