Welcome to RootsChat. Is this the right family ?
1871 census
William Roberts 44 head b Swineshead
Harriet Roberts 41 wife London
William Wheatley son in law 22 Lincoln
Mary Ann Wheatley wife 19 Scothern
John Robt Hy Wheatley son 3 Lincoln
William Ernest Wheatley son 0 Lincoln
address St Paul , Lincolnshire
This seems to tie in with your related post on Harriet Roberts and hopefully will give a starting point for anyone looking.