You might be looking for an Army marriage?
I guess the parents were John Wilkins, b 1842 Devon, and Kate, b 1852?
1881 census has John as Private 50th Brigade, at the 11th Hussars Barracks, Hounslow
Reference RG11, Piece 1340, Folio 119, Page 25
Wilkins, John Head Married M 40 Private b Devonport, Devon
Wilkins, Kate Wife Married F 28 b London
Wilkins, Thomas Son M 3 Scholar b London
Wilkins, John Son M 2 b Dublin, Ireland
Wilkins, Ernest Son M 8 months b Dover, Kent