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What's the meaning of 'blood sister/brother'?

Answers · 4

2
Perhaps you mean that when two little boys are very good friends. They slightly cut themselves and mix their blood. This makes them blood brothers.(Friends forever) A brother that shares one parent with you is called a half brother.
1
A Blood Brother or Sister is one who shares blood with you. As in has 1 or both parents the same. The alternative to this would be a "Step" brother or sister.

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