This one has got my head spinning! Helen Jack married Walter Duncan Oct 4 1850 in Edinburgh. Walter died sometime between 1854 and 1858. Helen remarried in 1858 and her parents are given as Thomas Jack and Euphemia Allan. Neither are noted as being deceased at that point. On her death record, parents are given as Thomas Jack and Ellen Robertson - a grandson is the informant.
So here's the puzzle - I have a Thomas and Euphemia on 1841 and 1851 in Edinburgh which I'm pretty certain are the correct two. However, I'm struggling to find deaths for them. There is a Thomas Jack who died in 1853 in Leith age 62 which might be him. If it is, there is presumably no way I can get his parents?
Turning to Euphemia, a record on Family Search suggests her father may be John. Again struggling to find a death for her.
No idea who the Ellen Robertson on the death record may be as I cannot find a marriage for a Thomas Jack and Ellen Robertson anywhere!