You need to find out more about what a working cocker is, I think.
It isn't just a cocker which works, it is a specific type of cocker. As you can see from Alfie (who IS a working type cocker) they look quite different to the show type cockers, but they ARE still cocker spaniels. Take a look at the previous threads on this subject and see the photos which have been posted there. Then you can be well-informed for the next time your brother has a go.
But, just ignore your brother anyway. He obviously knows which buttons to press to wind you up!
Alfie is beautiful.
However I am once again quite saddened that a breeder has failed to ensure that the new owner knows exactly what they are buying.