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Your first frenemies, lifelong allies, and the only people allowed to insult you.
means Female siblings who share your parents, your secrets, and roughly half your wardrobe.
from From Old Norse systir and Proto-Indo-European swesor, threading back through nearly every European tongue — the word is almost as old as the bond.
Convent codeNuns called sisters for shared spiritual kinship.
SisterhoodTerm powered entire feminist movements worldwide.
Shared DNASiblings share about 50 percent of genes.