What do "eldest official", "second official" and "third official" mean in Feng Shui?

The eldest son is an official, the eldest son is an official; the second son is an official, the second son is an official; the third son is an official, the third son is an official.

The eldest son, the second son, and the third son refer to the ranking of the brothers of the buried son. The first son is called the eldest son, also called the eldest son, and the second son is called the second son, also called the second brother. The third son is called Laosan, also called Sanfang.

The so-called official means being able to succeed in official career, that is, being able to be an official.