Further to my original posting, I am posting additional family data that I have gathered to date, following a suggestion from a Senior on the Essex Board.

Here is the family data that I have gathered so far; some of it has been validated from reliable sources; some of it is still tenuous.
Grandmother Rose Ellen was probably born in April of 1872 in Westminster to George & Elizabeth Potter (not yet confirmed). Rose Ellen may have had a brother, John R. (b. Marylebone, 1863) another brother, Fred (b. Chelsea abt. 1871) and a sister, Emily E. (also b. Chelsea abt. 1871) - but these are not confirmed.
I believe that Fred Bryant and Rose Ellen Potter were married in Farnham in 1890, but have not confirmed that - waiting for death certs before I start to spend money on cert copies!
The UK-born children of whom I am aware are:
Fred b. Mar 1895 in London
James A. b. Apr 1896 in Bristol. He served with the CEF and was killed at Ypres on Jul 25, 1916.
Mary b. Aug 1897 in Bristol
Caroline D. b. Nov 1899 in Derby
Olive G. b. Mar 1904 in West Ham (confirmed by Birth cert - my mom)
Ellen I. b. jul 1906 in West Ham
There were also four other sibs, including a George, but they may have been born in Canada, following their emigration.
If these data trigger any links to families being worked on by researchers in Glous or Essex, I will be ecstatic!
Robert in Kanata