John
to know more about Martha's mother you need to know her maiden name to help find her on earlier censuses.
This is the only marriage of a James Fox to an Alice in the time range but it didn't take place in the area so I'm not totally sure it is the right couple.
Marriages Dec 1872
Fox James Auckland 10a 396
possible spouse
Raine Alice Auckland 10a 396
The way to know for sure is to obtain Martha's birth certificate. You can order certificates direct from the General Registry Office.
http://www.gro.gov.uk/gro/content/certificates/James is more straightforward to follow back.
1861 census RG9 1355 folio 55
Little Piddle Piddletown Dorset
John Fox 44 Stratton Dorset Head Married Ag Lab
Elizabeth Fox 40 Portesham Dorset Wife Married
James Fox 21 Stratton Dorset Son Ag lab
Ann Fox 14 Stratton Dorset Daughter Ag lab
George Fox 11 Stratton Dorset Son
William Fox 9 Stratton Dorset Son
Kezia Fox 7 Stratton Dorset Daughter
Annie Fox 4 Piddletown Dorset Daughter
Jane Fox 2 Piddletown Dorset Daughter
1851 census HO107 1858 folio 440
Stratton Dorset
John Fox 33 West Morton Dorset Head Married Farm Labourer
Elizabeth Fox 29 Portesham Dorset Wife Married
James Fox 11 Stratton Dorset So Farm Labourer
John Fox 9 Bradford Peverell Dorset Son
Elizabeth Fox 7 Bradford Peverell Dorset Daughter
Sarah Fox 5 Bradford Peverell Dorset Daughter
Ann Fox 3 Stratton Dorset Daughter
George Fox 1 Stratton Dorset Son
Robert Day 65 Not Known Lodger Unmarried Farm Labourer
1841 census HO107 284/5 folio 5
Billey Whits? Bradford Peverell Dorset
John Fox 25 born Dorset Ag lab
Elizabeth Fox 20 born Dorset
James Fox 2 born Dorset
John Fox 1 Mo Born Dorset
Marriages Sep 1838
CHURCHILL Elizabeth Dorchester &c 8 69
FOX John Dorchester &c. 8 69
Baptism Stratton
4-Aug-1839; James Critchell; s; John; Elizabeth; FOX; Stratton; Labourer
(probably more likely Churchill)
There is only about 8% of Dorset parishes covered on the IGI up to 1812 so you will probably do much better in tracking the Fox and Churchill families through the Dorset online parish clerk
http://www.dorset-opc.com/index.htm1871 census RG10 2154 folio 72
Smiths Cross Drewsteignton Dorset
John Fox 48 West Moredon Dorset Head Married Gamekeeper
Elizabeth Fox 47 Portesham Dorset Wife Married
Jane Fox 11 Broadmayne Dorset Daughter
Charles Fox 7 Piddletown Dorset Son
Anna Fox 14 Piddletown Dorset Niece
1881 census RG11 2419 folio 54
Hutton Somerset
John Fox 61 Morton Dorset Head Married Gamekeeper
Ellen Fox 52 Portesham Dorset Wife Married
Deaths Mar 1890
Fox Elizabeth 66 Axbridge 5c 48?3
1891 census RG12 1919 folio 40
High Street Hutton Somerset
John Fox 65 Dorset W, Moreton Head Widower Agricultural Labourer
Deaths Jun 1897
Fox John 74 Axbridge 5c 326
This may be Elizabeth's baptism. Her marriage details would confirm who her father was
Elizabeth Churchill
Christening: 12 AUG 1821 Portisham, Dorset
Father: John Churchill
Mother: Elizabeth
and sibling
CHURCHILL, Mary Ann
Christening Date:5 Oct 1823 Portisham, Dorset
Father:John CHURCHILL
Mother:Elizabeth
other children may have been baptised at Toller Fratrum
For James and Alice Fox and what happened to them you first need to eliminate Scotland
http://www.scotlandspeople.gov.uk/to see whether they stayed there or returned to England.
Regards
Valda