What do you call your teacher's qualifications ~

A is called d, usually called brother. After all, A's master is older and his apprentice is older, but they are also ranked according to their age of entry. This situation is quite common. Whoever has been in the door for a long time is a brother. For example, a 10-year-old child was accepted by master B at the age of three, and another 20-year-old D was accepted by master C at the age of fifteen. Then this 20-year-old D will be called 10-year-old brother. There are fewer cases of who is older and who is older, which appears on the teacher of Xiaomen. The second question is the same. For women, the above criteria are also established, and the elder sister is younger than the younger sister.

Then there are lineal and non-lineal, clan and separation, blood relationship and so on.