I don't know any married a Jane Dackin but try looking at church records of other local parishes ie Darowen, Cemmaes, Newtown, Llanllwchaiarn, Tregynon, Aberhafesp, Llanwnog, Bettws Cedewain, Cemmaes and Trefeglwys. When there were about a dozen children to each family, the children of each were all named after their aunts and uncles so each generation there would be about a dozen Ellis Jones and there are a few John Ellis Jones. Hope you are connected, it's great family going back to the princes, well worth the search! My husband also has an Ann David on his tree but she was from Llanymawddwy. We have one John Ellis Jones 1897-1951 who married Florence May and they are buried at Llanllwchaiarn. Also have a J. Ellis Jones son of Ellis Jones and Sarah A. nee . Davies. I hope this might be helpful. Have you joined the Montgomeryshire Genealogical Society? Best wishes, Hilary