Soup for emergency rooms' family members (8)
I believe the answer is:
brothers
'family members' is the definition.
(brother is a type of family member)
'soup for emergency rooms'' is the wordplay.
'soup' becomes 'broth' (broth is a kind of soup).
'for' means one lot of letters go next to another.
'emergency rooms'' becomes 'ERs'.
'broth'+'ers'='BROTHERS'
(Other definitions for brothers that I've seen before include "Fraternal relatives" , "Male siblings" , "Jack and Algy turn out to be (Wilde)" , "(Roman Catholic) monks" , "Siblings (in arms or in law?)" .)