I'm afraid the noble family you mentioned is only a noble family in modern history. I think it's just a coincidence. I want to ask why there is such a high proportion abroad. I think there are about two reasons.

First, some sensitive people involved in political relations went into exile abroad and settled there.

Secondly, most of them are rich, powerful or connected, and naturally want to send their children abroad for further study and broaden their horizons. After going out, I found that the outside world was wonderful, so I stayed. This is normal.