Charlotte (Richardson) Dobson is almost certainly, but not proven, the daughter of James Richardson and Hannah (unknown) (Richardson) Dobson. This is based on mtDNA tests done on maternal line descendants of Charlotte Richardson and Barbara Ann Richardson which shows that they were sisters. She did not match matralineal descendant of Mary Flintoff's sister. See http://www.wikitree.com/wiki/Richardson-1743 for more details.