I have since found out that my G. Grandfather "Samuel Edgar Brown" and his brother "Charles F. Brown" were the s/o George W. Brown & Elizabeth Sambles (spelt Sanbills in the 1851 NB Census).
Samuel's death cert. said his mother was Elizabeth Gamble and Charles' death cert. said Eliza Fambles.
I still haven't found any children for Charles.
Elizabeth Sambles was the d/o William Sambles of England & Rose Anne Watters of Belfast, Ireland. Wm. arrived in Canada in 1830 and Anne in 1831.