What does N&N mean in Chat?

Niece and nephew

In the lineal kinship system used in the English-speaking world, a niece or nephew is a child of someone's sibling or sibling-in-law (and would view that person as an aunt or uncle). A niece is female and a nephew is male. The term nibling has been used in place of the common, gender-specific terms in some specialist literature.As aunt/uncle and niece/nephew are separated by one generation, they are an example of a second-degree relationship. They are 25% related by blood.

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