A family member in the country ain't crude (5-5)

I believe the answer is:

great-niece

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'a family member' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'in the country ain't crude' is the wordplay.
'in the' indicates putting letters inside.
'country' becomes 'greece' (Greece is a European country).
'crude' is an anagram indicator.
'aint' anagrammed gives 'atni'.
'greece' placed around 'atni' is 'GREAT-NIECE'.

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