The census which shows John and Thomas Hill BOTH aged 13 is 1861 - rg9 piece 2374 fol 31 p.14, I'm looking on ancestry and assumed cos both the boys were the same age they were twins?? Maybe an error on the census?
census info for Joseph and Judith and their children so at least I have something right
I really thought Joseph and Susannah were the parents for Joseph b.1849.
An error

double checked as I had looked at the reference you gave previously for 1861c before I posted the childrens ages if you take a look at the
original 1861 census entry John's age noted as 13 & Thomas noted as 10
Just to confirm you know for certain from a birth certificate of one of Joseph Hill & Judith’s children that her maiden name is THOMPSON and Joseph's occupation is a Bricklayer

Hmm just been digging around and found a Joseph Hill in 1871 census - rg10 pce 3318 fol 4 p.2 mother Mary and father William, but this can't be my Joseph as I know he was in Halifax by 1871
Yes there are a lot of Joseph Hill's born c 1849
Your Joseph Hill born c 1849 pob has been consistently
SPALDING Lincolnshire occ
BRICKLAYER this Joseph Hill pob is
Pinchbeck, Lincolnshire and his occupation in 1871 is an
AG. LAB.
I think the only way I'm going to get some concrete info is if I order the marriage cert for Joseph and Judith marriage sep 1871 91 770 Halifax - am I correct?
Yes, the only way to be 100% certain of Joseph’s father’s name is to obtain his marriage certificate to Judith Thompson and then go from there
Who knows my reply 17 may turn out to be your correct Hill family - we'll have to wait and see

Unfortunately I cannot see this marriage on Ancestry to view the details

– they do have marriages for Halifax at St John the Baptist Church
You may already have this but have posted just in case
This looks to be Judith's burial & Joseph's
West Yorkshire, Non-Conformist Records, 1646-1985Judith Hill died age 68 (1851) burial 22 Dec 1919,
Q23, S Marriott
Archive Location: Calderdale Reel Number: Halifax; CR33
Joseph Hill age 78 (1846) burial 9 Aug 1924,
Q23, George Goode (Curate All Souls)
Archive Location: Calderdale Reel Number: Halifax; CR33 Ref Number: WYC1369/1/2/3