Isaac was born in Turton (not Entwistle)
Isaac was a farm servant, son of James Mather, a farmer from Entwistle. He was the son of James (recorded on marriage), and was a weaver, 26 in 1841 living near his father at Edge Fold.
In 1841, Isaac and Betty (26 & 22) were at Edge Fold, Edgworth and had Betty (aged 1).
1851 Isaac (37) is a farmer of 16 acres at Whittaker's, Entwistle with wife Betty (32), daughter Elizabeth (11), and James (9), Sophia (5), Simon (2) and Luke (1mo).
1861 Isaac (47) a farmer of 6 acres at Whittaker's, Entwistle with wife Betty (42), and James (19), Sophia (15)(, Simon (12), Luke (10), Ruth (6), John (3), Sarah Jane (1), Esther (3wks). All the children were born at Entwistle.
1871 Isherwood fold - Isaac (b.Turton, 56, farmer of 9 acres), Elizabeth (50, b.Darwen) with Luke (20), William (17), Ruth (16) etc
1881 Isaac and Elizabeth (67 & 66) are still farming at Isherwood Fold Farm, Edgworth with wife Elizabeth, now known as Isabella. With them are Alice (23), Sarah Jane (21), Andrew (22), Esther (20), and James and Ruth Knowles and their baby James.