James son of John
James and Margaret were from Wigan (see 1851 census), they married there in 1828 and the first children were born there. James (or Jacob) second marriage was Roman Catholic, and shows his father was John.
In 1841, James and Margaret (both 30), were with William (9), James (7), Jane (5), Joseph (2) and John (5 months) at Commission Street, SW Bolton (see map).
In 1851, James and wife Margaret (42 & 40) were in Derby Street, East Bolton with William (19), James (16), Joseph (12), John (10) and Mary (7).
Margaret, wife of James Mather died 4 February 1860, aged 53 years (headstone). A month later, James married Mary Hornby. (The only marriage to a Mary 1853-61 is Mary Hornby in 1861).
17 Jan 1861 Jacobum (i.e. James) Mather of Derby Street, son of Joannis (i.e. John) married Mariam (i.e. Mary) Hornby of Lever Bridge, daughter of Jacobi Hornby at St Peter & St Paul Roman Catholic Church, Bolton.
In 1861, James and Mary (52, born Wigan & 38) were at 59 Derby Street, Bradford, Bolton with John (20) and Mary (17)