Thank you for the link to Ann Matthewman's birth details. This is James and Mary's daughter - on the right track right family.
Ann was their sixth child - the others were all born in Wakefield, Yorkshire.
In 1848, Mary gave birth to another daughter in Wakefield. She died the same year - I presume either during childbirth or as a result of complications.
I will follow up the leads of brother's name and occupation.