jone是英語國家中很普通的姓,所以就被用來指普通人.如：I am just a regular Jones
樓主的話是指：(在家庭財富和其他方面)做到與普通人壹樣.
見下面的網上討論：
I understand this phrase to mean keeping up at least the appearance of wealth or class to the roughly equivalent degree that one's neighbors exhibit same,particularly in terms of the display of physical possessions.
供參考！