Sorry about this, but have we got another anomaly in this family - Minnie?
1881 census - RG11 4669 folio 6 page 5 - Handsworth
Robert Bond - 42 - labourer in colliery - born Fleet
Elenor Bond - 42 born Newcastle
Mary (May) - 14, Thomas William - 9, Lily - 6, Rose - 3 and Robert Edward 2 weeks PLUS
William Hewit - 22 - son in law born Newark
Minnie Hewit - 19 - wife - born Barton
Robert William Hewit - 6 months - grandson born Handsworth
However, the only marriage I can find for William Hewit(t) with a Mary (Minnie's correct forename ??) on the same page is in Sheffield district in 1881 and Mary is Mary ELIZABETH OXLEY

As Minnie is only 19 she surely can't be a widow, can she? I can't see a marriage between Bond and Oxley 1875-1881.