
Hi,
I think I have solved your mystery. I have the Branthwaite Surname Researchers Site and have found the following information in my records for you.
The Mary Branthwaite in the census as mother-in-law is Mary Bell born 1802 in Workington. Mary Bell married Joshua Branthwaite 1842 St. Michael, Workington and the Eleanor who married John Warwick is their daughter born 12 April 1835.
Joshua is still alive and on the 1861 Census so must have died between 61 and 71 and Mary must have gone to live with her then son-in-law John Warwick and her daughter Eleanor after Joshua died.
Here they are on the 1851 with family
1851 Vulcans Lane, Workington
Joshua Head 51 Butcher and Farmer of 10 acres born Lamplugh, Cumberland
Mary wife 49 born Workington, Cumberland
Joshua son 17 butcher born Workington
Elleanor daughter 16 at home born Workington
Jonathon son scholar at home born Workington
Ester daughter scholar at home born Workington
John 5 son scholar at home born Workington
I have this family traced down to present day and a contact if there is an interest plus the rest of the Branthwaite clan of course!
Cheers
ChristineK