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I was married before and had 3 children. My wife and I got divorced and have since remarried other people. My new wife and I had a son together and my ex wife and her new husband had a son. These two young boys will be only related by their older siblings. Is there a name for what they are? I've searched the web but cannot find a term

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Since there is no blood/genetic relation between such siblings of half-siblings, there may not be an official term. Unofficially people sometimes refer to them as cross siblings which I believe is a play on cross cousins, which is an official genetic term.

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    Although I had never seen the term before this answer, the wikipedia article on "Siblings" includes a section on cross siblings [en.wikipedia.org/wiki/Sibling#Cross_siblings ]. Whatever the derivation, the label will gain currency, as these relationships become more frequent. – bgwiehle Aug 15 '14 at 12:39

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