Hello Karen Oh dear, I see your problem. Jones again! I have tons of them and they don't ever make it easy. I think the greatest challenge in life is to have relatives or antecedants surnamed Jones. That can keep you going for donkeys years.... decades.... decades.... Death certificates are only as good as the person handing over the information to the, most likely, funeral director. It could be correct, but in many cases during my research, there are mistakes galore. It would depend upon the informant being very close to the family, especially within the inner family circle for reasonable accuracy, but then daughters and sons don't always get it right, either. Friends or cousins might also tend to get it very wrong. Of course, there could be the possibility that John Jones married twice, both times to a Sarah. I've had that happen a few times. The considerable amount of mothers dying in or after childbirth and then the father looking around for another wife to take care of his children, was part and parcel of those times. A suggestion is to have other researchers take a look at those certificates to see if everyone can agree what the writing of the surnames really is. Apart from bad writing, other factors are in the hearing of the surname being given by the informant to the funeral people, or indeed in the case of the marriage to the celebrant - particularly where accents are concerned. So, they write it down on paper, then later transcribe it to the proper form - ah, can one read one's own writing of the day before? Mills and Halls could easily be misinterpreted re. sound and accent, but Rees or Rhys, surely not. I recall many decades ago when I had to give my surname to officials for some or other reason, and I thought I pronounced it as Price, but several times believe it or not, it came across as Morris! Must have been my grandparents Welsh accent coming through after two generations in Australia. No doubt, it still lingers, hidden to all but the very observant. A radiologist, the other week, said me that I couldn't be Australian born. Got that wrong! This could become quite expensive, but once having exhausted all of means, perhaps a marriage certificate or a death certificate of one of David's brothers or sisters (if he had any known to you) might be the way to solve this problem. Best wishes Graham Melbourne Oz