purple 紫色，紫色在古代是皇家专用的颜色，born in the purple意为出身高贵；出身皇族，后沿用表示富二代，有钱人。

【例句】
He was born in the purple and was brought up in the grand palace.
他出身于皇族，在宏伟的宫殿中长大。

It was not only those that were born in the purple were nobler than others in this society.
在我们这个社会中那些出身名门贵族的人决不比他人高贵。