Have you seen John born 1836 on the 1891 census. He is with his children Sarah and Edith and son in law Charles Lyons(married to Louisa.
He is recorded as M but must be a widower if you have the correct information re Sarah's death.
There isn't another John Oswin/Orwin around the place so I think he must have re-married.
There is a marriage for a John Oswin - possible bride Mary Marriott
registered qrt ending December 1900 at Leicester 7a, 631
The decision is yours

Tricia