Mr Langley saw Olivia most weeks and said she "absolutely adored" her half siblings.

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She believes she has siblings or half-siblings from Spruill's previous relationships, including the one with her mother.

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One is that the embryonic birds in the favoured eggs really do have better genetic health than their less-favoured half-siblings.

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There was no immediate comment on Pola's book from her half-siblings, Nastassja and Nikolai, when their representatives were contacted by Reuters news agency.

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The result was 25 sets of half-siblings.

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Avital's mother and father, along with half of his 10 siblings, were killed during the Holocaust.

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As is well known, twins come in two varieties: fraternal, in which the individuals have half their genes in common, just like ordinary siblings, and identical, in which the individuals have all their genes in common.

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Nearly half of middle borns said they have been asked by their older or younger siblings for money.

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The siblings were not asked to purchase extra seats on the outbound flight because it was half empty.

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Nearly half of them expect to have to support aging relatives, adult children, grandchildren, and siblings, and of that fraction, 70% expect to be supporting their adult children.

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