Famenemy, pl. famenemies: A family member who is also your enemy.

This can be blood relatives, related by marriage or just considered family. Mother/Father, Sister/Brother, Husband/Wife, boyfriend/girlfriend, Aunt/uncle, real cousin/play cousin etc. {frienemy}
My famenemy sister used our family trust and sympathy to set me up for a financial loss.
by CCedar September 2, 2019
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