A child, conceived by selected IVF treatment, so as to have compatible tissue that could be used to treat an existing sick brother or sister

Alternative spelling of half sibling

Alternative form of stepsibling

Alternative spelling of milk sibling

A person who is not one's biological sibling but was nursed by the same woman as oneself.

A person who shares the same set of biological parents

A person who is not one's biological sibling, but was legally and socially raised as if they were.

The sibling of one's spouse. / The spouse of one's sibling. / The spouse of the sibling of one's spouse. / The sibling of the spouse of one's sibling.

A sibling sharing a single parent, as distinguished from a full sibling or sibling-german, from a step-sibling, or from a sibling-like figure such as a blood sibling.

Alternative form of full-sibling