Statements such as "All WILL be living in Stanground" are bound to invoke Murphy's law.
I cannot see any Eagles in Stanground in 1851, or in 1841 either, although in 1851 there are various Eagles in Lincs, Northants and Cambs with a birthplace of Stanground, but no Richard
There are no burials of a Richard of the right age in Stanground, although there is a Mary Eagle age 31 buried on 14 Feb 1823
What evidence do you have that they were (a) living and (b) in Stanground, in 1851?
Regards
David