Hi,
I don't think that Henry HOBBS was George's stepson more like half brother - from 1851 census:
Stanford Dingley Dist 6
HO107/1691 FOLIO 146 PAGE 3
Joseph HOBBS, Head, 31, Journeyman Tanner
Hannah HOBBS, Wife, 41, , b Pewsey Wilts
Henry HOBBS, Son, 4
Charles HOBBS, Son, 2
Ann HOBBS, Daur, 11m
Thomas CHAPMAN, Stepson, 15, Blacksmith
Marth CHAPMAN, Stepdaur, 12
Albert CHAPMAN, Stepson, 10
Edwin CHAPMAN, Stepson, 8
All born Stanford Dingley except for Hannah.
Living next door are Charles, Lucy and Anne CHAPMAN (as per 1841)
Regards
Harry