One of the family? That would be telling (8)
I believe the answer is:
relation
This clue might be a double definition.
'one of the family?' is the first definition.
'relation' can be an answer for 'family?' (family is a kind of relation). I am not certain of the 'one of the' bit.
'telling' is the second definition.
(to relate a story can mean to tell it)
'that would be' acts as a link.
Can you help me to learn more?
(Other definitions for relation that I've seen before include "wife?" , "Person connected by blood or marriage" , "Account" , "Grandchild, perhaps" , "Affinity" .)