Thanks Mike,
Yes I'd agree with all that you have said. I think I have found the three NIBLETT children not in the 1901 household, of Arthur and Bertha ROBERTS.
Edwin NIBLETT at RG13/ 5048 - 159 - 8 - 40.
William NIBLETT at RG13/ 2785 - 48 - 11 - 62.
Kate NIBLETT at RG13/ 4920 - 7 - 6 - 37.
Don.