You forgot the period. And The capital "c". I don't know what type of question this is so I just helped with the grammar!
A. Best the reason why it is not better (even though it sounds right) is because it says "out of the five cousins" there for we are comparing ben to five other people and he is the best.
Lots .. Onamonipea,Allusion,metaphors,similes,personification,idioms,hyperbole.your welcome.:)
I don't get what your asking help with