A sibling is one of two or more individuals having one or both parents in common. A male sibling is a brother, and a female sibling is a sister. .... have different fathers) are known as uterine sib...
legal-dictionary.thefreedictionary.com/Half-brother and half-sister
In the horse breeding industry, the term "
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But if you share the same mother but have a different father, he is only
If they two siblings have the same father and two different mothers they are