disease-free sibling 不发病的同族对照幼崽
free sibling
免费的兄弟姐妹
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Property rights also mean you are free to sell off a game or toy to a sibling, as long as the buyer fully understands the consequences of the deal.
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Also consider the likely therapeutic and life-saving benefit to the sick sibling, the benefits to the family as a whole, and a new child free of the disease.
BBC: Paying for a sibling to save Mark
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