Hi
I've just started tracing my family tree and your request re: Mary Ann adds an interesting piece to my puzzle.
If indeed she is d/o James and Elizabeth then she is one 8 children that I have found so far; she had left home before the 1841 census so up until now I had not come across a Mary Ann. I am descended from a Edwin Stephen 1849, who appears in the 1851 census listed as James and Elizabeth's grandson. I can't find any birth/baptism record for him so don't which of James and Elizabeth's children is his parent!
James Forder 1783 is s/o John Forder and Elizabeth Spencer m. 8 Nov 1773 whilst Elizabeth (nee. Cooper) is d/o John Cooper and Sophia Caute m. 30 May 1785.
Hope this helps with your research, I'd be keen to hear any further information you have on James' father, John. I have more information on Mary Ann's siblings if you need it too; for example: her oldest son Jesse is born in the same year as James and Elizabeth's youngest son, also called Jesse (aged 3 in 1841 census) however he does not appear in the household 10 years later. The family lived on Manor farm in both 1841 and 1851.
All the best.