John Ravilious doesn't give many dates in his line. However I think he has the Alfretons born about 30 years later than I do. Also there is at least one source that indicates that Amicia died without issue, as the Alfreton property did not continue in the Lathom family. In fact this source indicates that Amicia's husband married 2ndly Joan de Millom (I have Joan's husband as a grandson of this one). Yet my dates seem to fit with CP's Chaworth line which includes Alice de Alfreton (Amicia's sister according to all sources involved).
Father: Robert de ALFRETON & Norton b: ABT 1172 in Alfreton, Belper, Derbyshire, England
Marriage 1 Robert de LATHOM b: ABT 1198 in Lathom, Ormskirk, Lancashire, England