You're very welcome.
We don't know how many of the Guard served from 1805 to 1815, but if someone went through the archive, they could find out (and translate).
As well as Drouot at Alava, there are about 5 British men, most famous are the Sweny brothers: share.google/BVdTkNOSa3bI...
Although there must be cases where brothers fought at Trafalgar & Waterloo, there can't have been many instances where both brothers also met Napoleon.
