What do you call a colleague, a teacher and a classmate?

The address of the same teacher is as follows:

1. peers in the same school are called brothers and sisters, or brothers and sisters.

2. The other disciples in the same school, like the students in the school, are called by the names of their brothers, younger brothers, younger brothers, sisters and younger sisters. There are names such as elder sister and younger sister.

My master's brother's name is Shi Bo.

Your master's sister is called Shigu.

5. My master's brother is called Uncle Shi.

6. Your master's master is called grandmaster.

The above is the address of the same teacher in the same session for reference.