I managed to find them in the 1901 census, Doris was wrongly indexed as Doria (it's clearly Doris from the image)
St Aldate
6 Newtown Road
Robert C DINGLE, Head, Mar, 29, Rope Makers Manager, Oxford
Rosa DINGLE, Wife, Mar, 29, , Oxford
Ernest C DINGLE, Son, Un, 15, Hairdresser, Oxford
Doris DINGLE, Daur, U, 2, , Oxford
Robert DINGLE, Son, U, 3m, , Oxford
Bertha BROWN, Serv, U, 13, Domestic (I think) General Servant, New Yatt ?? Oxford
I struggled to find Robert or Rosa in earlier census, but then found Ernest:
1891:
RG12/1168
St Ebbe Oxford
17 Albert Street
Robert C DINGLE, Head, M, 35, Ropemaker's Shopman, Oxford, Oxon
Sarah E DINGLE, Wife, , 34, , Great Milton, Oxon
Elizabeth A, Daur, , 14, Scholar, Oxford Oxon
Albert E, Son, , 11, Scholar, Oxford Oxon
Ernest C, Son, , 5, Scholar, Oxford Oxon
In 1881:
St Ebbe
RG11/1503
27 Albert St
Robert C DINGLE, Head, Mar, 25, Shopman Ropemakers, Oxfordshire Oxford
Sarah DINGLE, Wife, Mar, 24, , Oxfordshire Great Milton
Annie E DINGLE, Daur, , 4, , Oxfordshire Oxford
Albert E DINGLE, Son, , 2, , Oxfordshire Oxford
1871:
St Ebbe
RG10/1439
29 Blackfriars Rd
Robert DINGLE, Head, Mar, 40, Whitesmith, Local Preacher, Oxford
Anna DINGLE, Wife, Mar, 36, Dressmaker, Benwold ?? Bedfordshire
Robert DINGLE, Son, , 15, Errand Boy, Oxford
Isaac DINGLE, Son, , 11, Shop (rest obliterated), Oxford
Ellen M DINGLE, Daur, , 9, , Oxford
Charles A DINGLE, Son, , 7, Scholar, Oxford
Samuel J DINGLE, Son, , 3, Scholar, Oxford
Alfred E DINGLE, Son, , 1m(I think), , Oxford
In 1861:
St Ebbe
RG9/895
29 Blackfriars Rd
Robert DINGLE, Head, Mar, 30, Whitesmith, Oxford
Martha DINGLE, Wife, Mar, 31, ,Oxford
Annie Martha DINGLE, Daur, , 6, Scholar, Oxford
Robert Charles DINGLE, Son, , 5, Scholar, Oxford
Lydia Ann S DINGLE, Daur, , 3, , South Hinksey Berks
Isaac Salmon DINGLE, Son, , 1, , Oxford
And finally this looks like the death of Robert C
Oxford
September Quarter 1907
Vol 3a Page 459
Regards
Harry