Well
I should say that there are two William's born abt 3 years apart on irishgenealogy.
One son of John, one son of George.
I posted earlier that William the informer was a Tailor.
I then found a record of a George Lamie on 1881 Slaters whom was also a Tailor and am making the presumption was William the informer was the son of George and not John.
I suppose that's beside the point as the Elizabeth on the 1901 Census HAD to have been the wife of William the tobacconist and NOT William the informer.
Hope that makes sense

Tara