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en.wikipedia.org/wiki/Sibling

A sibling is one of two or more individuals having one or both parents in common. A full sibling ... Half-siblings are second-degree relatives and have, on average, a 25% overlap in their human genetic variation. .... This means the unshared parents are either siblings or parent and child (similar terminology is used in horse ...

www.merriam-webster.com/dictionary/half%20sister

Define half sister: a sister related through one parent only — half sister in a sentence.

www.yourdictionary.com/half-sister

The definition of a half sister is a blood-sibling with whom you share one parent but not both. An example of a half sister is the baby your mother has with her ...

en.oxforddictionaries.com/definition/us/half-sister

Definition of half-sister in US English - a sister with whom one has only one parent in common.

www.collinsdictionary.com/us/dictionary/english/half-sister

Half-sister definition: Someone's half-sister is a girl or woman who has either the same mother or the same... | Meaning, pronunciation, translations and ...

dictionary.cambridge.org/us/dictionary/english/half-sister

half-sister definition, meaning, what is half-sister: a sister who is the daughter of only one of your parents. Learn more.

legal-dictionary.thefreedictionary.com/Half-brother+and+half-sister

HALF-BROTHER AND HALF-SISTER. Persons who have the same father but different mothers; or the same mother but different fathers. A Law Dictionary ...

www.thefreedictionary.com/half+sister

Define half sister. half sister synonyms, half sister pronunciation, half sister translation, English dictionary definition of half sister. n. A sister to whom one is ...

www.macmillandictionary.com/us/dictionary/american/half-sister

Define half sister (noun) and get synonyms. What is half sister (noun)? half sister (noun) meaning, pronunciation and more by Macmillan Dictionary.