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TheCardinalKing t1_j62u2v4 wrote

Reply to comment by lobo1217 in Why is “reverse cowgirl” illegal in Alabama? by Disastrous_Onion_411

It is.

So your father has a daughter with his mother and then has you with his daughter-sister, making your her your mother-sister-aunt. She then marries your grandpa, becoming your grandma now too.

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lobo1217 t1_j637e6g wrote

No no no... I don't take marriage into account. I'm talking about biological mothers and fathers

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TheCardinalKing t1_j63um6s wrote

Hmm... trickier, but still possible.

So your mother makes love to her father and gives birth to a son. She then has a child with her son, which is you.

She is your mother as she directly gave birth to you.

She is your sister for being the sibling to your father, who is also your sibling.

She is your aunt for being your father's sister.

She is your grandmother for being the mother of your father.

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lobo1217 t1_j65rvlb wrote

All correct apart from sister. She is NOT your sister. Your father is your "half brother", and I would call your mother and your father also half siblings to each other, but that doesn't make your mother your biological sibling. Your mother would be your sibling-in-law.

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TheCardinalKing t1_j66ox54 wrote

I guess your mom would be your half-sister, but it's the closest I could get if we want her to be your grandma too while keeping blood-relation. I think managing to keep everyone being blood-related is good enough.

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