Just in case anyone is looking for me I have found Eliza Cubbon, unmarried on the 1851 Census, birth year 1821, birth place Jurby and still living at Balla Kinnag on her own. Also found her on 1881 Census born about 1819 Jurby as an inmate at the lunatic asylum in Braddan and still there 1901 Census, birth year about 1820. She died 1904 aged 84. Cant find her 1861, 71 or 91 - wonder where she was in 1861 and 1871? Robert and Margaret were too old to be her parents - I think Margaret born c1766 and Robert c1770.
So, still looking for the parents of Eliza and also Robert Cubbon.
Also interesting to note that Robert and Margaret married in Bride and Margaret was from Andreas (where they were later living). Maybe Robert was from Bride?
Sandra