大家庭的成员由血缘(祖父母、父母、孩子、兄弟、姐妹等)或婚姻(丈夫、妻子、婆婆等)联系起来。

The members of an extended family are related by blood (grandparent, parents, children, brothers, sisters, etc.) or by marriage (husbands, wives, mothers-in-law, etc).

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系谱学家早已将家庭关系定义为血缘或者婚姻关系。

Genealogists have long defined familial relations along bloodlines or marriage.

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我的父母亲因血缘、婚姻、和父母的身份而结合在一起。

My parents were bound by blood, marriage, and parenthood.

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