Welcome to RootsChat from me too.
Certainly Thomas ROSS was the son of John Dawes ROSS:
"On the same day [22 May 1847], in this town, aged 68, Mr. Thomas Ross, third son of the late Rev. John Dawes Ross, late vicar of Syston, and rector of Peatling, in this county."
Friday, May 28, 1847
Publication: Leicester Journal
Another death notice:
"On Saturday, aged 68, Mr. Thomas Ross, for forty years the faithful servant of the Messers. Burgess, woolstaplers, of this town."
Saturday, May 29, 1847
Publication: Leicester Chronicle
However, you need to be sure that your George is the son of this Thomas. As Rosie says, it is always better to search backwards. Having said that, Is there a will for Thomas ROSS that may mention children? Or have you seen the marriage entry for George and Jane STEVENSON - are there any witnesses mentioned that may help?