How can you marry a Latvian to begin with, if you're a Russian and marry somebody who was a commoner?

首先,一个俄国人怎么能娶一个拉脱维亚人,何况女方还是个平民

耶鲁公开课 - 欧洲文明课程节选

I was taking my younger child home from a play date on Sunday and he asked me out of the blue, ?" "Why can't you marry your mother or your father?"

周日我带我的小儿子去玩，回家的路上,他突然问我，“你为什么不能和你的父母结婚“

耶鲁公开课 - 心理学导论课程节选