の中でも

especially among; even within

→ の
phrase Rare #39,142
especially among; even within Highlights something as notable within a larger group or range.
JA: 私は人ごみの中でも彼を見分けることができる。
EN: I can pick him out even in a crowd.

親子の中でも金銭は他人。

When it comes to money, even parents and children are strangers.