If they consider you their aunt, then you are their aunt, in my humble opinion. I tend to view family relationships in terms of affinity rather than consanguity--which is why I have an extra set of grandparents, but don't consider my mother's father my "grandfather".
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"With all its sham, drudgery, and broken dreams,
it is still a beautiful world.
Be cheerful. Strive to be happy."
-Desiderata
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