Aghadowey,
Yes, I suspect as much - regarding a large generation of KEPPLE/KEPPEL siblings. I think there's at least another family of that name producing children at the same time, but I don't think I can afford to send away for all of the birth registrations to know the exact truth. How privileged we are in the UK to have the various Censuses from 1841 until 1911 into which we can dip and fit whole families together decade by decade...
However, for the time being, I think I'll definitely send away for that 1880 marriage, and perhaps, more tentatively, that 1892 William KEPPEL birth certificate...
keith