Member of the fam (3)
I think it could be either:
(Other definitions for bro that I've seen before include "Word used for male relative" , "US form of address" , "who may have a 28 [SIS]?" , "somewhere one feels close to" , "American greeting" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">member of the fam</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sis that I've seen before include "Little sibling" , "spies ..." , "Family member (informal)" , "Secret Intelligence Service (abbreviation)" , "Girl" .)