Guess what I had for Christmas! A copy of the 1881 Census which has some Scothern Sleafords viz.

William Aged 40 born in Scothern
Wif Lucy aged 38 born in Houghton on the Hill
George William aged 5 born in Freiston
Charles aged 3 born in Scothern
Henry aged 1 born in Scothern
Sarah A. aged 2 months born in Scothern

Another Household has Sarah a Widow born in Walcot aged 74.

Some more entries bornin Scothern but now living elsewhere
are Joseph aged 29 living in Lincoln with wife Anna and child Edith.

Thomas aged 27 living as a boarder in a household in Lincoln.

Hope this helps trace your family.