I live in Liverpool
I know a Hull family well - I drink with them in my local - all the John Hull I have ever known were all called Jack as a nickname .
is this your John ?
Baptism: 4 Oct 1835 St Mary, Tarleton, Lancashire, England
Jane Hull - Daughter of Joseph Hull & Rebecca
Abode: Tarleton
Occupation: Roper
Baptised by: G. Thomas Curate
Register: Baptisms 1813 - 1838, Page 177, Entry 1411
Source: LDS Film 1278941
Baptism: 29 Oct 1837 St Mary, Tarleton, Lancashire, England
Rebecca Hull - Daughter of Joseph Hull & Rebecca
Abode: Tarleton
Occupation: Roper
Baptised by: G. Thomas Curate
Register: Baptisms 1813 - 1838, Page 191, Entry 1525
Source: LDS Film 1278941
Baptism: 17 Nov 1839 St Mary, Tarleton, Lancashire, England
John Hull - Son of Joseph Hull & Rebecca
Abode: Tarleton
Occupation: Farmer
Baptised by: C. W. Richards B. A. Offig. Minister
Register: Baptisms 1839 - 1888, Page 7, Entry 54
Source: LDS Film 1278941
Baptism: 15 Aug 1841 St Mary, Tarleton, Lancashire, England
Henry Hull - Son of Joseph Hull & Rebecca
Abode: Tarleton
Occupation: Farmer
Baptised by: G. M. Drummond Curate
Register: Baptisms 1839 - 1888, Page 20, Entry 156
Source: LDS Film 1278941
Joseph went from a Roper - to a Farmer - what was a Roper ??