Hi Geraldine,
I think I may have worked out who your Catherine Hughes is. I believe she is the daughter of Arthur John Hughes who was living in Onchan in the 1881 census with his wife Catherine. You will find them on the 1881 census at Ballamenaugh, Onchan. Arthur is listed as John.
John Hughes 44 mariner bn Ireland
Kate Hughes 40 staymaker bn Conchan
Catherine Hughes 13 scholar bn Onchan
Isabella Hughes 7 scholar bn Onchan
(Thomas) Arthur Hughes 5 scholar bn Onchan
John Hughes 3
I didn't know before now who Catherine junior married. I believe Arthur John is the youngest brother of my ggg grandfather James Hughes.
Hope this helps
Jane