From my reply above
James birth reg shows mothers maiden name was Davy
In 1851 Jane is a 43yr old widow of a miner & James is 8. Address is the same as 1841
1851 William & brother Thomas are both agricultural labourers living in Lewtrenchard
Father - John Littlejohns died March qtr 1850 aged 46 buried 20.3.1850 Bridestowe
How have you linked William to John Littlejohns b Bulkworthy given he does not appear on any census with that birthplace?
How have you established Jane was Jane Edds given that James birth reg shows his mmn as Davy?
There is a marriage in 1851 on freebmd for a Jane Littlejohns formerly Davis so James birth reg could be a mistranscription
Jane Littlejohns Full Age
Marriage Date: Dec 1851
Marriage Place: Bridestowe, Devon, England
Residence Place: Bridestowe
Religion: Anglican
Father: John DavisSpouse: John Gerry
In 1861 they are in Cornwall
Elizabeth 1839
Elizabeth's birth reg also shows mmn Davy
LITTLEJOHNS, ELIZABETH DAVY
GRO Reference: 1839 M Quarter in OKEHAMPTON Volume 10 Page 191