Hi Winarae,
In my message dated Tuesday, 20 May 2008, at 12:15 p.m. below I put my readings of the 1881 census entries which include Catharine Quirk and Margaret Quayle, domestic servants in Derby Square, and George Clague. As you'll have seen, the girls are not in the same household at the time of the census, but of course it's possible they could have moved around sometime afterwards.
If people feel they have all the available information in front of them it can help get an idea of what to do next.
I couldn't see George Watson or George Quayle in the 1891 census. Did James & Catherine have any other children do you know?
It would be interesting to see what George said about his father on his marriage certificate.