Hi Helen The only reliable research is your own Everyone elses needs verifying Nivard Ovington in Cornwall (UK) > 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