Hope you don't mind, I had a bit more of a look at the Herefordshire censuses (censii?

)
1851 Census: Much Dewchurch, Kents Common
Thomas WATKINS H M 43 Slater & plaster/ master 1 lab Heref Much Birch
Isabella WATKINS W M 42 America
Thomas WATKINS S Un 15 Learning his fathers trade Heref Much Birch
Isabella WATKINS D Un 12 Heref Much Birch
Albert Williams WATKINS S U 9 Heref Much Birch
George ANDREWS Boarder U 16 Ag Lab Heref Little Dewchurch
1871 Census: Henry Street, Ross
Thomas WATKINS H M 56 Plasterer Heref Much Birch
Isabel WATKINS W M 55 India (British Subject)
James WATKINS S U 18 Plasterer Heref Much Dewchurch
Herbert WATKINS Gson U 2 Heref Hereford
Emma SIMMONDS Serv U 12 Gen Serv Heref Brampton Abbots
1891 Census: Henry Street, Ross
Thomas WATKINS H M 78 Plasterer Heref Much Birch
Isabella WATKINS W M 78 West Indies
James WATKINS S Un 39 Plasterer Heref Much Dewchurch
Herbert WATKINS Gson Un 22 Clerk Heref Hereford
William BULLON lodger Un 27 Waggoner Heref Broadway
On neither the 1871 or 1891 census was Herbert listed as a cripple, or indeed having any ailments/conditions.
Hope that helps
Best wishes