Hi Kizzy, It appears you have a definite link between a John Hughes & Margt Robertson and a John Hughes & Ellen McCormick as per the death you have of Roseann Gray (nee Hughes). That link appears to be because Margt died in 1875 and John remarried to Ellen. That being the case, the death you have of John Hughes in 1869 is NOT the one you want. The marriage of John and Ellen took place in 1876 so perhaps someone can find them in subsequent censuses and then maybe you can find his correct death.
It pays not to be too literal with the certificates you find. The information disclosed is only as accurate as that known by the informant. Ages can be notoriously out by significant amounts because those offering that information in some cases had not a clue. The same goes for the names of parents who may have been long gone or left behind in Ireland for example. The best point to start with is what you already know and that is that you have a definite link between John Hughes, Margt Robertson and Ellen McCormick and that means you don't have John's death cert yet. I have experienced all these anomalies myself over the years and I now know that even though you expect a certificate to be positive proof its not always the case. Sometimes you just have to put all the pieces together. Don't despair, you're getting warmer.
Sage.
