Hi,
it really looks like William is Thomas and Elizabeths son and he was born before they married often they just adopted the family name but his birth and chr records would probably be under Woodcraft.
Thats the misfortune of the 1841 it doesn't give relationships. Maybe because Elizabeth had just had James, William was staying with relations in 1841 to give the couple a break??
There were no other Scouldings of any variation that I could see in 1841.
In 1861 here is the family again and William is now put down as Scolding but I feel his records would be under Woodcraft.
Thomas Scolding Head 42 Ag lab b. Tivetshall st Marys
Elizabeth " Wife 42 b. Aslacton
William " Son 22 Ag Lab b. Tivetshall St Marys
James " Son 20 Ag lab "
Robert " Son 14 Ag lab b. "
Susanna " dau 11 "
Amelia " dau 9 "
Sarah " dau 7 "
No address just living in Tivetshall St Marys
Next door (or next entry) is
Elizabeth Woodcraft widow 82 House Proprietor b.Tibenham
Susanna Woodcraft Gdau 10 b. Tivetshall St Marys
No other Woodcrafts in Tivetshall St marys
I did find a James Skoulding age 30/38 unmarried working as a servant for Eliza Burgess who was a licensed Victualler and farmer of 360 acres living at the public house (?) Tivetshall St Marys
couldn't see any others.
If you ever want any more lookups just ask ok.
All the best Angela.