That's very generous of you, Claudia - please don't go to too much trouble! I think Mary Moore / Fildes may have died in about 1849, leaving three children. Last night I finally found the 1851 census for the family, but it's damaged - the youngest child, John Joseph, is at the top of a page, and the rest of the family is on the ripped and soaked illegible previous page unfortunately so I'm still not sure if Mary was still alive at that time.
Caroline