Here are the various bits of information relating to James's two marriages and ten children:
There is a marriage bond for James Postlethwaite, 27, husbandman, and Ann Gibson, 21, both of Dalton-in-Furness, dated 6-May-1751.
James and Ann married 8-May-1851 at Dalton-in-Furness.
There is a marriage bond for James Postlethwaite, 40, farmer, and Elizabeth Postlethwaite, 23, both of Pennington, dated 8-Jul-1753.
In a LPRS publication, there is a marriage between John Postlethwaite and Elizabeth Postlethwaite on 8-Jul-1753 at Cartmel.
There are 2 Janes, daughter of James Postlethwaite, baptised at Dalton on 16-Feb-1752 and 16-Mar-1752 respectively.
James, son of James Postlethwaite of Lowfield House, baptised at Pennington 1-Jan-1754
Dorothy, dau of James Postlethwaite of Lowfield House, baptised at Pennington 1-Jan-1756
Betty, dau of James Postlethwaite of Lowfield House, baptised at Pennington 1-Jan-1758
Margaret, dau of James Postlethwaite of Lowfield House, baptised at Pennington 20-Apr-1760
Thomas, son of James Postlethwaite of Lowfield House, baptised at Pennington 13-Jun-1762
William, son of James Postlethwaite of Lowfield House, baptised at Pennington 6-Jan-1765
Henry, son of James & Elizabeth Postlethwaite, baptised at Pennington 26-Jul-1767, born 26-Jun-1767
Margaret, dau of James Postlethwaite of Lindale, baptised at Dalton 1-Jan-1773
John, son of James Postlethwaite of Lindale, baptised at Dalton 15-Sep-1776.
In the Whitehaven archives, there is an admission and surrender by James Postlethwaite of Lowfield House, Pennington and Elizabeth his wife, dated 28-Oct-1757.
In the Lowick records, there is a Dade baptism for Dorothy Sill, identifying Dorothy Postlethwaite's mother as being Ann Gibson, daughter of Edmund Gibson of Dalton.
There is a burial for an Anne Postlethwaite at Dalton on 26-May-1754
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There are several inconsistencies here:
The names on the marriage bond don't quite match the names on the marriage at Cartmel. Given they are the same date, it seems likely to me that there is a typo in either the Cartmel transcription or original register.
The ages on the 2 marriage bonds are not consistent - with James ageing 13 years in 2. My view on this is that ages on marriage bonds are often widely inaccurate, so both could be several years out here.
If the Cartmel marriage is the correct one, then it would seem likely that all but Jane would be children of James and Elizabeth. This would contradict Dorothy Sill's Dade baptism. I'm in difficulty here, as is it reasonable that Dorothy's grandmother was incorrectly identified?
I think the Anne Postlethwaite who died in Dalton in 1754 is not part of this family, as by then James is at Lowfield House.
Given the surrender information, I'm fairly sure that Betty onwards are children of Thomas and Elizabeth, but how about James and Dorothy?
Pete