Have you gone off the Smethcott idea?
With the youngest son Thomas, baptised at Smethcott, 12 February 1832, there is a good indication that he went to South Africa.
Last seen in the 1851 census in Liverpool, when he was 19, and a Plasterer.
https://www.familysearch.org/ark:/61903/1:1:SG16-RYKThen a marriage in Rhuddlan, Flintshire, 11 July 1853 (image is on ancestry)
https://www.familysearch.org/ark:/61903/1:1:KCT4-NJ4Thomas Rogers, 21, Bachelor, Plasterer, father Richard Rogers, Smith
+
Mary Sumner, 21, Spinster, father Samuel Sumner, Gentleman's Servant
Residence for both Rhyl
Three births
Samuel John, Sep 1854, St. Asaph
Sarah Ann, Sep 1856, St. Asaph
and
ROGERS, ROBERT
Mother's Maiden Surname: SUMNER
GRO Reference: 1858 D Quarter in WIRRAL Volume 08A Page 371
Looks like Robert was baptised at St. Peter, Pietermaritzburg, Natal, 16 December 1860
Born 25 September 1858
Parents Thomas & Mary
Father a Plaisterer
https://www.familysearch.org/ark:/61903/3:1:33S7-9TWY-F18And baptised again there, along with a sister Elizabeth Jane, 10 September 1862!
This time giving date of birth as 25 Sep 1859

Anyway, there are more children, and then a death of Thomas Rogers in Pietermaritzburg, 8 May 1869.
Age 37, Plasterer. Died of apoplexy.
https://www.familysearch.org/ark:/61903/3:1:3Q9M-C91Q-QSY5-F