Hi Suz
Thanks so much for your help.
As you say Lewis didn't live long (poor soul) so I won't put any more efforts into looking for what happened to him.
Yes, I have the 1871 census for Limerick/Elizabeth and Minnie (Minnie is my connection)
I think you may well have found Mary Rosa in 1871 with her uncle - Elkenab. With this info I think I may have the wrong death cert for Limerick (I think I have Elkenab's) so back to searching on this one!
As you have found looks like Mary Rosa didn't marry and died in 1899.
Only William, Henry and Alfred remain a mystery so I am definately in a much better position that I was 24 hours ago!
Thanks again
Sparkle