Can anybody advise me, please, if there is any sort of reference work (reliable) that would give me reliable genealogical data on this family? I thought I had worked out my husband's line, but now there appears to be a difference of opinion on some of the Gratwicke parentage and marriages for some people and I would like to try and establish once and for all a relatively reliable reference source. Any help would be most gratefully received. Best wishes, Helen