Don't think you have John's death correctly?
1891 census: Class: RG12; Piece: 2605; Folio: 11; Page: 16
West Street, Alford, Lincolnshire
Vickers, John Head M 38 General Labourer b Alford
Vickers, Emma Wife F 38 b Legbourne
Vickers, Phoebe Daughter F 5 Scholar b Alford
Vickers, William Son M 4 Scholar b Alford
Aaah!
Death, December qtr 1899
Spilsby district vol 7a, page 380
Vickers, John age 46
(Spilsby Registration District includes the parish of Alford)