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Explanation: In this case only, highly dependant on context, this expression would usually refer to a child (grand garcon/ frere aine) or as here with a much more connotative sens of someone with responsibilities. It can also refer to size when emphasis is put on "big".
Cador means head/leader.
Beware of the register though, it is a little familiar so you might use " or italics.
Hope that will do.
Petit Robert (spelling)
alx Local time: 18:33 Native speaker of: French PRO pts in pair: 119