excellent result Sillgen !
One of the anoying things about ancestry.co.uk is that you don't seem to be able to go to an address in the census
You can - but it aint easy !!! (Except for 1881, where the address is indexed)
and no, he wasnt with the Brooks in '91 - nor were they at the same address.
Discounting the military for now, that means that in 1891:-
- he wasnt using a DoB +/- 5 years of expected year
- Nor specifically Brighton as a PoB
- and maybe
Frederick itself has been mistransed - and its not down as an F