Family relative (5)
(Other definitions for sister that I've seen before include "Resist about the sibling" , "Female sibling" , "'Nurse, nun or relative (6)'" , "A kinswoman" , "of the same origin" .)
'family relative' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for auntie that I've seen before include "Name for BBC" , "Unite a strange relative" , "Relative (familiar)" , "Unite a strange family member" , "Kinswoman" .)
'family relative' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for nephew that I've seen before include "Sibling's son" , "Edward V to Richard III relation" , "Sister's son" , "Has a duty (to do something)" , "A sibling's child" .)
'family relative' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for niece that I've seen before include "Family girl" , "Brother's daughter" , "A younger female relative" , "Brother or sister's daughter" , "A sibling's daughter" .)
'family relative' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for uncle that I've seen before include "Sam, perhaps" , "A parent's brother" , "Brother of one's parent" , "Grandfather's son" , "He's related" .)