词汇与表达：kin-akin-kinship

One of two or more things that are closely akin.
关系密切的事物：两个或多个同类相似的事物之一。
akin 同族的  元素周期表
Kinship plays a big part: rich parents tend to produce rich kids.
亲属关系至关重要：富裕的父母更有可能养育出富裕后代。

The form must be signed by next of kin.
这表格必须由最近亲签字。